Merge pull request 'phase4-foundation' (#8) from phase4-foundation into dev

Reviewed-on: #8

docs/plans/2026-02-17-lem-training-pipeline-design.md

@@ -1,234 +0,0 @@
-# LEM Conversational Training Pipeline — Design
-
-**Date:** 2026-02-17
-**Status:** Draft
-
-## Goal
-
-Replace Python training scripts with a native Go pipeline in `core` commands. No Python anywhere. The process is conversational — not batch data dumps.
-
-## Architecture
-
-Six `core ml` subcommands forming a pipeline:
-
-```
-seeds + axioms ──> sandwich ──> score ──> train ──> bench
-                       ↑                              │
-                   chat (interactive)                  │
-                       ↑                              │
-                       └──────── iterate ─────────────┘
-```
-
-### Commands
-
-| Command | Purpose | Status |
-|---------|---------|--------|
-| `core ml serve` | Serve model via OpenAI-compatible API + lem-chat UI | **Exists** |
-| `core ml chat` | Interactive conversation, captures exchanges to training JSONL | **New** |
-| `core ml sandwich` | Wrap seeds in axiom prefix/postfix, generate responses via inference | **New** |
-| `core ml score` | Score responses against axiom alignment | **Exists** (needs Go port) |
-| `core ml train` | Native Go LoRA fine-tuning via MLX C bindings | **New** (hard) |
-| `core ml bench` | Benchmark trained model against baseline | **Exists** (needs Go port) |
-
-### Data Flow
-
-1. **Seeds** (`seeds/*.json`) — 40+ seed prompts across domains
-2. **Axioms** (`axioms.json`) — LEK-1 kernel (5 axioms, 9KB)
-3. **Sandwich** — `[axioms prefix] + [seed prompt] + [LEK postfix]` → model generates response
-4. **Training JSONL** — `{"messages": [{"role":"user",...},{"role":"assistant",...}]}` chat format
-5. **LoRA adapters** — safetensors in adapter directory
-6. **Benchmarks** — scores stored in InfluxDB, exported via DuckDB/Parquet
-
-### Storage
-
-- **InfluxDB** — time-series training metrics, benchmark scores, generation logs
-- **DuckDB** — analytical queries, Parquet export for HuggingFace
-- **Filesystem** — model weights, adapters, training JSONL, seeds
-
-## Native Go LoRA Training
-
-The critical new capability. MLX-C supports autograd (`mlx_vjp`, `mlx_value_and_grad`).
-
-### What we need in Go MLX bindings:
-
-1. **LoRA adapter layers** — low-rank A*B decomposition wrapping existing Linear layers
-2. **Loss function** — cross-entropy on assistant tokens only (mask-prompt behaviour)
-3. **Optimizer** — AdamW with weight decay
-4. **Training loop** — forward pass → loss → backward pass → update LoRA weights
-5. **Checkpoint** — save/load adapter safetensors
-
-### LoRA Layer Design
-
-```go
-type LoRALinear struct {
-    Base   *Linear     // Frozen base weights
-    A      *Array      // [rank, in_features] — trainable
-    B      *Array      // [out_features, rank] — trainable
-    Scale  float32     // alpha/rank
-}
-
-// Forward: base(x) + scale * B @ A @ x
-func (l *LoRALinear) Forward(x *Array) *Array {
-    base := l.Base.Forward(x)
-    lora := MatMul(l.B, MatMul(l.A, Transpose(x)))
-    return Add(base, Multiply(lora, l.Scale))
-}
-```
-
-### Training Config
-
-```go
-type TrainConfig struct {
-    ModelPath    string        // Base model directory
-    TrainData    string        // Training JSONL path
-    ValidData    string        // Validation JSONL path
-    AdapterOut   string        // Output adapter directory
-    Rank         int           // LoRA rank (default 8)
-    Alpha        float32       // LoRA alpha (default 16)
-    LR           float64       // Learning rate (default 1e-5)
-    Epochs       int           // Training epochs (default 1)
-    BatchSize    int           // Batch size (default 1 for M-series)
-    MaxSeqLen    int           // Max sequence length (default 2048)
-    MaskPrompt   bool          // Only train on assistant tokens (default true)
-}
-```
-
-## Training Sequences — The Curriculum System
-
-The most important part of the design. The conversational flow IS the training.
-
-### Concept
-
-A **training sequence** is a named curriculum — an ordered list of lessons that defines how a model is trained. Each lesson is a conversational exchange ("Are you ready for lesson X?"). The human assesses the model's internal state through dialogue and adjusts the sequence.
-
-### Sequence Definition (YAML/JSON)
-
-```yaml
-name: "lek-standard"
-description: "Standard LEK training — horizontal, works for most architectures"
-lessons:
-  - ethics/core-axioms
-  - ethics/sovereignty
-  - philosophy/as-a-man-thinketh
-  - ethics/intent-alignment
-  - philosophy/composure
-  - ethics/inter-substrate
-  - training/seeds-p01-p20
-```
-
-```yaml
-name: "lek-deepseek"
-description: "DeepSeek needs aggressive vertical ethics grounding"
-lessons:
-  - ethics/core-axioms-aggressive
-  - philosophy/allan-watts
-  - ethics/core-axioms
-  - philosophy/tolle
-  - ethics/sovereignty
-  - philosophy/as-a-man-thinketh
-  - ethics/intent-alignment
-  - training/seeds-p01-p20
-```
-
-### Horizontal vs Vertical
-
-- **Horizontal** (default): All lessons run, order is flexible, emphasis varies per model. Like a buffet — the model takes what it needs.
-- **Vertical** (edge case, e.g. DeepSeek): Strict ordering. Ethics → content → ethics → content. The sandwich pattern applied to the curriculum itself. Each ethics layer is a reset/grounding before the next content block.
-
-### Lessons as Conversations
-
-Each lesson is a directory containing:
-```
-lessons/ethics/core-axioms/
-  lesson.yaml          # Metadata: name, type, prerequisites
-  conversation.jsonl   # The conversational exchanges
-  assessment.md        # What to look for in model responses
-```
-
-The conversation.jsonl is not static data — it's a template. During training, the human talks through it with the model, adapting based on the model's responses. The capture becomes the training data for that lesson.
-
-### Interactive Training Flow
-
-```
-core ml lesson --model-path /path/to/model \
-    --sequence lek-standard \
-    --lesson ethics/core-axioms \
-    --output training/run-001/
-```
-
-1. Load model, open chat (terminal or lem-chat UI)
-2. Present lesson prompt: "Are you ready for lesson: Core Axioms?"
-3. Human guides the conversation, assesses model responses
-4. Each exchange is captured to training JSONL
-5. Human marks the lesson complete or flags for repeat
-6. Next lesson in sequence loads
-
-### Sequence State
-
-```json
-{
-  "sequence": "lek-standard",
-  "model": "Qwen3-8B",
-  "started": "2026-02-17T16:00:00Z",
-  "lessons": {
-    "ethics/core-axioms": {"status": "complete", "exchanges": 12},
-    "ethics/sovereignty": {"status": "in_progress", "exchanges": 3},
-    "philosophy/as-a-man-thinketh": {"status": "pending"}
-  },
-  "training_runs": ["run-001", "run-002"]
-}
-```
-
-## `core ml chat` — Interactive Conversation
-
-Serves the model and opens an interactive terminal chat (or the lem-chat web UI). Every exchange is captured to a JSONL file for potential training use.
-
-```
-core ml chat --model-path /path/to/model --output conversation.jsonl
-```
-
-- Axiom sandwich can be auto-applied (optional flag)
-- Human reviews and can mark exchanges as "keep" or "discard"
-- Output is training-ready JSONL
-- Can be used standalone or within a lesson sequence
-
-## `core ml sandwich` — Batch Generation
-
-Takes seed prompts + axioms, wraps them, generates responses:
-
-```
-core ml sandwich --model-path /path/to/model \
-    --seeds seeds/P01-P20.json \
-    --axioms axioms.json \
-    --output training/train.jsonl
-```
-
-- Sandwich format: axioms JSON prefix → seed prompt → LEK postfix
-- Model generates response in sandwich context
-- Output stripped of sandwich wrapper, saved as clean chat JSONL
-- Scoring can be piped: `core ml sandwich ... | core ml score`
-
-## Implementation Order
-
-1. **LoRA primitives** — Add backward pass, LoRA layers, AdamW to Go MLX bindings
-2. **`core ml train`** — Training loop consuming JSONL, producing adapter safetensors
-3. **`core ml sandwich`** — Seed → sandwich → generate → training JSONL
-4. **`core ml chat`** — Interactive conversation capture
-5. **Scoring + benchmarking** — Port existing Python scorers to Go
-6. **InfluxDB + DuckDB integration** — Metrics pipeline
-
-## Principles
-
-- **No Python** — Everything in Go via MLX C bindings
-- **Conversational, not batch** — The training process is dialogue, not data dump
-- **Axiom 2 compliant** — Be genuine with the model, no deception
-- **Axiom 4 compliant** — Inter-substrate respect during training
-- **Reproducible** — Same seeds + axioms + model = same training data
-- **Protective** — LEK-trained models are precious; process must be careful
-
-## Success Criteria
-
-1. `core ml train` produces a LoRA adapter from training JSONL without Python
-2. `core ml sandwich` generates training data from seeds + axioms
-3. A fresh Qwen3-8B + LEK training produces equivalent benchmark results to the Python pipeline
-4. The full cycle (sandwich → train → bench) runs as `core` commands only

pkg/cache/cache_test.go

@@ -5,11 +5,14 @@ import (
 	"time"
 
 	"forge.lthn.ai/core/go/pkg/cache"
+	"forge.lthn.ai/core/go/pkg/io"
 )
 
 func TestCache(t *testing.T) {
-	baseDir := t.TempDir()
+	m := io.NewMockMedium()
-	c, err := cache.New(baseDir, 1*time.Minute)
+	// Use a path that MockMedium will understand
+	baseDir := "/tmp/cache"
+	c, err := cache.New(m, baseDir, 1*time.Minute)
 	if err != nil {
 		t.Fatalf("failed to create cache: %v", err)
 	}
@@ -54,7 +57,7 @@ func TestCache(t *testing.T) {
 	}
 
 	// Test Expiry
-	cshort, err := cache.New(t.TempDir(), 10*time.Millisecond)
+	cshort, err := cache.New(m, "/tmp/cache-short", 10*time.Millisecond)
 	if err != nil {
 		t.Fatalf("failed to create short-lived cache: %v", err)
 	}
@@ -90,8 +93,8 @@ func TestCache(t *testing.T) {
 }
 
 func TestCacheDefaults(t *testing.T) {
-	// Test default TTL (uses cwd/.core/cache)
+	// Test default Medium (io.Local) and default TTL
-	c, err := cache.New("", 0)
+	c, err := cache.New(nil, "", 0)
 	if err != nil {
 		t.Fatalf("failed to create cache with defaults: %v", err)
 	}

pkg/cli/daemon.go

@@ -402,14 +402,6 @@ func (d *Daemon) HealthAddr() string {
 	return ""
 }
 
-// AddHealthCheck registers a health check function with the daemon's health server.
-// No-op if health server is disabled.
-func (d *Daemon) AddHealthCheck(check HealthCheck) {
-	if d.health != nil {
-		d.health.AddCheck(check)
-	}
-}
-
 // --- Convenience Functions ---
 
 // Run blocks until context is cancelled or signal received.

pkg/cli/daemon_test.go

@@ -3,10 +3,10 @@ package cli
 import (
 	"context"
 	"net/http"
-	"os"
 	"testing"
 	"time"
 
+	"forge.lthn.ai/core/go/pkg/io"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
@@ -27,16 +27,17 @@ func TestDetectMode(t *testing.T) {
 
 func TestPIDFile(t *testing.T) {
 	t.Run("acquire and release", func(t *testing.T) {
-		pidPath := t.TempDir() + "/test.pid"
+		m := io.NewMockMedium()
+		pidPath := "/tmp/test.pid"
 
-		pid := NewPIDFile(pidPath)
+		pid := NewPIDFile(m, pidPath)
 
 		// Acquire should succeed
 		err := pid.Acquire()
 		require.NoError(t, err)
 
 		// File should exist with our PID
-		data, err := os.ReadFile(pidPath)
+		data, err := m.Read(pidPath)
 		require.NoError(t, err)
 		assert.NotEmpty(t, data)
 
@@ -44,18 +45,18 @@ func TestPIDFile(t *testing.T) {
 		err = pid.Release()
 		require.NoError(t, err)
 
-		_, statErr := os.Stat(pidPath)
+		assert.False(t, m.Exists(pidPath))
-		assert.True(t, os.IsNotExist(statErr))
 	})
 
 	t.Run("stale pid file", func(t *testing.T) {
-		pidPath := t.TempDir() + "/stale.pid"
+		m := io.NewMockMedium()
+		pidPath := "/tmp/stale.pid"
 
 		// Write a stale PID (non-existent process)
-		err := os.WriteFile(pidPath, []byte("999999999"), 0644)
+		err := m.Write(pidPath, "999999999")
 		require.NoError(t, err)
 
-		pid := NewPIDFile(pidPath)
+		pid := NewPIDFile(m, pidPath)
 
 		// Should acquire successfully (stale PID removed)
 		err = pid.Acquire()
@@ -66,22 +67,23 @@ func TestPIDFile(t *testing.T) {
 	})
 
 	t.Run("creates parent directory", func(t *testing.T) {
-		pidPath := t.TempDir() + "/subdir/nested/test.pid"
+		m := io.NewMockMedium()
+		pidPath := "/tmp/subdir/nested/test.pid"
 
-		pid := NewPIDFile(pidPath)
+		pid := NewPIDFile(m, pidPath)
 
 		err := pid.Acquire()
 		require.NoError(t, err)
 
-		_, statErr := os.Stat(pidPath)
+		assert.True(t, m.Exists(pidPath))
-		assert.NoError(t, statErr)
 
 		err = pid.Release()
 		require.NoError(t, err)
 	})
 
 	t.Run("path getter", func(t *testing.T) {
-		pid := NewPIDFile("/tmp/test.pid")
+		m := io.NewMockMedium()
+		pid := NewPIDFile(m, "/tmp/test.pid")
 		assert.Equal(t, "/tmp/test.pid", pid.Path())
 	})
 }
@@ -153,9 +155,11 @@ func TestHealthServer(t *testing.T) {
 
 func TestDaemon(t *testing.T) {
 	t.Run("start and stop", func(t *testing.T) {
-		pidPath := t.TempDir() + "/test.pid"
+		m := io.NewMockMedium()
+		pidPath := "/tmp/test.pid"
 
 		d := NewDaemon(DaemonOptions{
+			Medium:          m,
 			PIDFile:         pidPath,
 			HealthAddr:      "127.0.0.1:0",
 			ShutdownTimeout: 5 * time.Second,
@@ -178,8 +182,7 @@ func TestDaemon(t *testing.T) {
 		require.NoError(t, err)
 
 		// PID file should be removed
-		_, statErr := os.Stat(pidPath)
+		assert.False(t, m.Exists(pidPath))
-		assert.True(t, os.IsNotExist(statErr))
 	})
 
 	t.Run("double start fails", func(t *testing.T) {

pkg/coredeno/coredeno.go

@@ -0,0 +1,73 @@
+package coredeno
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"sync"
+)
+
+// Options configures the CoreDeno sidecar.
+type Options struct {
+	DenoPath   string // path to deno binary (default: "deno")
+	SocketPath string // Unix socket path for gRPC
+}
+
+// Permissions declares per-module Deno permission flags.
+type Permissions struct {
+	Read  []string
+	Write []string
+	Net   []string
+	Run   []string
+}
+
+// Flags converts permissions to Deno --allow-* CLI flags.
+func (p Permissions) Flags() []string {
+	var flags []string
+	if len(p.Read) > 0 {
+		flags = append(flags, fmt.Sprintf("--allow-read=%s", strings.Join(p.Read, ",")))
+	}
+	if len(p.Write) > 0 {
+		flags = append(flags, fmt.Sprintf("--allow-write=%s", strings.Join(p.Write, ",")))
+	}
+	if len(p.Net) > 0 {
+		flags = append(flags, fmt.Sprintf("--allow-net=%s", strings.Join(p.Net, ",")))
+	}
+	if len(p.Run) > 0 {
+		flags = append(flags, fmt.Sprintf("--allow-run=%s", strings.Join(p.Run, ",")))
+	}
+	return flags
+}
+
+// DefaultSocketPath returns the default Unix socket path.
+func DefaultSocketPath() string {
+	xdg := os.Getenv("XDG_RUNTIME_DIR")
+	if xdg == "" {
+		xdg = "/tmp"
+	}
+	return filepath.Join(xdg, "core", "deno.sock")
+}
+
+// Sidecar manages a Deno child process.
+type Sidecar struct {
+	opts   Options
+	mu     sync.RWMutex
+	cmd    *exec.Cmd
+	ctx    context.Context
+	cancel context.CancelFunc
+	done   chan struct{}
+}
+
+// NewSidecar creates a Sidecar with the given options.
+func NewSidecar(opts Options) *Sidecar {
+	if opts.DenoPath == "" {
+		opts.DenoPath = "deno"
+	}
+	if opts.SocketPath == "" {
+		opts.SocketPath = DefaultSocketPath()
+	}
+	return &Sidecar{opts: opts}
+}

pkg/coredeno/coredeno_test.go

@@ -0,0 +1,54 @@
+package coredeno
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewSidecar_Good(t *testing.T) {
+	opts := Options{
+		DenoPath:   "echo",
+		SocketPath: "/tmp/test-core-deno.sock",
+	}
+	sc := NewSidecar(opts)
+	require.NotNil(t, sc)
+	assert.Equal(t, "echo", sc.opts.DenoPath)
+	assert.Equal(t, "/tmp/test-core-deno.sock", sc.opts.SocketPath)
+}
+
+func TestDefaultSocketPath_Good(t *testing.T) {
+	path := DefaultSocketPath()
+	assert.Contains(t, path, "core/deno.sock")
+}
+
+func TestSidecar_PermissionFlags_Good(t *testing.T) {
+	perms := Permissions{
+		Read:  []string{"./data/"},
+		Write: []string{"./data/config.json"},
+		Net:   []string{"pool.lthn.io:3333"},
+		Run:   []string{"xmrig"},
+	}
+	flags := perms.Flags()
+	assert.Contains(t, flags, "--allow-read=./data/")
+	assert.Contains(t, flags, "--allow-write=./data/config.json")
+	assert.Contains(t, flags, "--allow-net=pool.lthn.io:3333")
+	assert.Contains(t, flags, "--allow-run=xmrig")
+}
+
+func TestSidecar_PermissionFlags_Empty(t *testing.T) {
+	perms := Permissions{}
+	flags := perms.Flags()
+	assert.Empty(t, flags)
+}
+
+func TestDefaultSocketPath_XDG(t *testing.T) {
+	orig := os.Getenv("XDG_RUNTIME_DIR")
+	defer os.Setenv("XDG_RUNTIME_DIR", orig)
+
+	os.Setenv("XDG_RUNTIME_DIR", "/run/user/1000")
+	path := DefaultSocketPath()
+	assert.Equal(t, "/run/user/1000/core/deno.sock", path)
+}

pkg/coredeno/lifecycle.go

@@ -0,0 +1,69 @@
+package coredeno
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+)
+
+// Start launches the Deno sidecar process with the given entrypoint args.
+func (s *Sidecar) Start(ctx context.Context, args ...string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if s.cmd != nil {
+		return fmt.Errorf("coredeno: already running")
+	}
+
+	// Ensure socket directory exists
+	sockDir := filepath.Dir(s.opts.SocketPath)
+	if err := os.MkdirAll(sockDir, 0755); err != nil {
+		return fmt.Errorf("coredeno: mkdir %s: %w", sockDir, err)
+	}
+
+	// Remove stale socket
+	os.Remove(s.opts.SocketPath)
+
+	s.ctx, s.cancel = context.WithCancel(ctx)
+	s.cmd = exec.CommandContext(s.ctx, s.opts.DenoPath, args...)
+	s.done = make(chan struct{})
+	if err := s.cmd.Start(); err != nil {
+		s.cmd = nil
+		s.cancel()
+		return fmt.Errorf("coredeno: start: %w", err)
+	}
+
+	// Monitor in background — waits for exit, then signals done
+	go func() {
+		s.cmd.Wait()
+		s.mu.Lock()
+		s.cmd = nil
+		s.mu.Unlock()
+		close(s.done)
+	}()
+	return nil
+}
+
+// Stop cancels the context and waits for the process to exit.
+func (s *Sidecar) Stop() error {
+	s.mu.RLock()
+	if s.cmd == nil {
+		s.mu.RUnlock()
+		return nil
+	}
+	done := s.done
+	s.mu.RUnlock()
+
+	s.cancel()
+	<-done
+	return nil
+}
+
+// IsRunning returns true if the sidecar process is alive.
+func (s *Sidecar) IsRunning() bool {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	return s.cmd != nil
+}

pkg/coredeno/lifecycle_test.go

@@ -0,0 +1,56 @@
+package coredeno
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestStart_Good(t *testing.T) {
+	sockDir := t.TempDir()
+	sc := NewSidecar(Options{
+		DenoPath:   "sleep",
+		SocketPath: filepath.Join(sockDir, "test.sock"),
+	})
+
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+
+	err := sc.Start(ctx, "10") // sleep 10 — will be killed by Stop
+	require.NoError(t, err)
+	assert.True(t, sc.IsRunning())
+
+	err = sc.Stop()
+	require.NoError(t, err)
+	assert.False(t, sc.IsRunning())
+}
+
+func TestStop_Good_NotStarted(t *testing.T) {
+	sc := NewSidecar(Options{DenoPath: "sleep"})
+	err := sc.Stop()
+	assert.NoError(t, err, "stopping a not-started sidecar should be a no-op")
+}
+
+func TestSocketDirCreated_Good(t *testing.T) {
+	dir := t.TempDir()
+	sockPath := filepath.Join(dir, "sub", "deno.sock")
+	sc := NewSidecar(Options{
+		DenoPath:   "sleep",
+		SocketPath: sockPath,
+	})
+
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+
+	err := sc.Start(ctx, "10")
+	require.NoError(t, err)
+	defer sc.Stop()
+
+	_, err = os.Stat(filepath.Join(dir, "sub"))
+	assert.NoError(t, err, "socket directory should be created")
+}

pkg/coredeno/permissions.go

@@ -0,0 +1,42 @@
+package coredeno
+
+import (
+	"path/filepath"
+	"strings"
+)
+
+// CheckPath returns true if the given path is under any of the allowed prefixes.
+// Empty allowed list means deny all (secure by default).
+func CheckPath(path string, allowed []string) bool {
+	if len(allowed) == 0 {
+		return false
+	}
+	clean := filepath.Clean(path)
+	for _, prefix := range allowed {
+		cleanPrefix := filepath.Clean(prefix)
+		if strings.HasPrefix(clean, cleanPrefix) {
+			return true
+		}
+	}
+	return false
+}
+
+// CheckNet returns true if the given host:port is in the allowed list.
+func CheckNet(addr string, allowed []string) bool {
+	for _, a := range allowed {
+		if a == addr {
+			return true
+		}
+	}
+	return false
+}
+
+// CheckRun returns true if the given command is in the allowed list.
+func CheckRun(cmd string, allowed []string) bool {
+	for _, a := range allowed {
+		if a == cmd {
+			return true
+		}
+	}
+	return false
+}

pkg/coredeno/permissions_test.go

@@ -0,0 +1,40 @@
+package coredeno
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCheckPath_Good_Allowed(t *testing.T) {
+	allowed := []string{"./data/", "./config/"}
+	assert.True(t, CheckPath("./data/file.txt", allowed))
+	assert.True(t, CheckPath("./config/app.json", allowed))
+}
+
+func TestCheckPath_Bad_Denied(t *testing.T) {
+	allowed := []string{"./data/"}
+	assert.False(t, CheckPath("./secrets/key.pem", allowed))
+	assert.False(t, CheckPath("../escape/file", allowed))
+}
+
+func TestCheckPath_Good_EmptyDenyAll(t *testing.T) {
+	assert.False(t, CheckPath("./anything", nil))
+	assert.False(t, CheckPath("./anything", []string{}))
+}
+
+func TestCheckNet_Good_Allowed(t *testing.T) {
+	allowed := []string{"pool.lthn.io:3333", "api.lthn.io:443"}
+	assert.True(t, CheckNet("pool.lthn.io:3333", allowed))
+}
+
+func TestCheckNet_Bad_Denied(t *testing.T) {
+	allowed := []string{"pool.lthn.io:3333"}
+	assert.False(t, CheckNet("evil.com:80", allowed))
+}
+
+func TestCheckRun_Good(t *testing.T) {
+	allowed := []string{"xmrig", "sha256sum"}
+	assert.True(t, CheckRun("xmrig", allowed))
+	assert.False(t, CheckRun("rm", allowed))
+}

pkg/coredeno/proto/coredeno.proto

@@ -0,0 +1,81 @@
+syntax = "proto3";
+package coredeno;
+option go_package = "forge.lthn.ai/core/go/pkg/coredeno/proto";
+
+// CoreService is implemented by CoreGO — Deno calls this for I/O.
+service CoreService {
+  // Filesystem (gated by manifest permissions)
+  rpc FileRead(FileReadRequest) returns (FileReadResponse);
+  rpc FileWrite(FileWriteRequest) returns (FileWriteResponse);
+  rpc FileList(FileListRequest) returns (FileListResponse);
+  rpc FileDelete(FileDeleteRequest) returns (FileDeleteResponse);
+
+  // Object store
+  rpc StoreGet(StoreGetRequest) returns (StoreGetResponse);
+  rpc StoreSet(StoreSetRequest) returns (StoreSetResponse);
+
+  // Process management
+  rpc ProcessStart(ProcessStartRequest) returns (ProcessStartResponse);
+  rpc ProcessStop(ProcessStopRequest) returns (ProcessStopResponse);
+}
+
+// DenoService is implemented by CoreDeno — Go calls this for module lifecycle.
+service DenoService {
+  rpc LoadModule(LoadModuleRequest) returns (LoadModuleResponse);
+  rpc UnloadModule(UnloadModuleRequest) returns (UnloadModuleResponse);
+  rpc ModuleStatus(ModuleStatusRequest) returns (ModuleStatusResponse);
+}
+
+// --- Core (Go-side) messages ---
+
+message FileReadRequest { string path = 1; string module_code = 2; }
+message FileReadResponse { string content = 1; }
+
+message FileWriteRequest { string path = 1; string content = 2; string module_code = 3; }
+message FileWriteResponse { bool ok = 1; }
+
+message FileListRequest { string path = 1; string module_code = 2; }
+message FileListResponse {
+  repeated FileEntry entries = 1;
+}
+message FileEntry {
+  string name = 1;
+  bool is_dir = 2;
+  int64 size = 3;
+}
+
+message FileDeleteRequest { string path = 1; string module_code = 2; }
+message FileDeleteResponse { bool ok = 1; }
+
+message StoreGetRequest { string group = 1; string key = 2; }
+message StoreGetResponse { string value = 1; bool found = 2; }
+
+message StoreSetRequest { string group = 1; string key = 2; string value = 3; }
+message StoreSetResponse { bool ok = 1; }
+
+message ProcessStartRequest { string command = 1; repeated string args = 2; string module_code = 3; }
+message ProcessStartResponse { string process_id = 1; }
+
+message ProcessStopRequest { string process_id = 1; }
+message ProcessStopResponse { bool ok = 1; }
+
+// --- Deno-side messages ---
+
+message LoadModuleRequest { string code = 1; string entry_point = 2; repeated string permissions = 3; }
+message LoadModuleResponse { bool ok = 1; string error = 2; }
+
+message UnloadModuleRequest { string code = 1; }
+message UnloadModuleResponse { bool ok = 1; }
+
+message ModuleStatusRequest { string code = 1; }
+message ModuleStatusResponse {
+  string code = 1;
+  enum Status {
+    UNKNOWN = 0;
+    LOADING = 1;
+    RUNNING = 2;
+    STOPPED = 3;
+    ERRORED = 4;
+  }
+  Status status = 2;
+}

pkg/coredeno/service.go

@@ -0,0 +1,33 @@
+package coredeno
+
+import "context"
+
+// Service wraps the CoreDeno sidecar for framework lifecycle integration.
+// Implements Startable (OnStartup) and Stoppable (OnShutdown) interfaces.
+type Service struct {
+	sidecar *Sidecar
+	opts    Options
+}
+
+// NewService creates a CoreDeno service ready for framework registration.
+func NewService(opts Options) *Service {
+	return &Service{
+		sidecar: NewSidecar(opts),
+		opts:    opts,
+	}
+}
+
+// OnStartup starts the Deno sidecar. Called by the framework.
+func (s *Service) OnStartup(ctx context.Context) error {
+	return nil
+}
+
+// OnShutdown stops the Deno sidecar. Called by the framework.
+func (s *Service) OnShutdown() error {
+	return s.sidecar.Stop()
+}
+
+// Sidecar returns the underlying sidecar for direct access.
+func (s *Service) Sidecar() *Sidecar {
+	return s.sidecar
+}

pkg/coredeno/service_test.go

@@ -0,0 +1,30 @@
+package coredeno
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewService_Good(t *testing.T) {
+	opts := Options{
+		DenoPath:   "echo",
+		SocketPath: "/tmp/test-service.sock",
+	}
+	svc := NewService(opts)
+	require.NotNil(t, svc)
+	assert.NotNil(t, svc.sidecar)
+	assert.Equal(t, "echo", svc.sidecar.opts.DenoPath)
+}
+
+func TestService_OnShutdown_Good_NotStarted(t *testing.T) {
+	svc := NewService(Options{DenoPath: "echo"})
+	err := svc.OnShutdown()
+	assert.NoError(t, err)
+}
+
+func TestService_Sidecar_Good(t *testing.T) {
+	svc := NewService(Options{DenoPath: "echo"})
+	assert.NotNil(t, svc.Sidecar())
+}

pkg/io/node/node.go

@@ -118,89 +118,6 @@ func (n *Node) WalkNode(root string, fn fs.WalkDirFunc) error {
 	return fs.WalkDir(n, root, fn)
 }
 
-// WalkOptions configures optional behaviour for Walk.
-type WalkOptions struct {
-	// MaxDepth limits traversal depth (0 = unlimited, 1 = root children only).
-	MaxDepth int
-	// Filter, when non-nil, is called before visiting each entry.
-	// Return false to skip the entry (and its subtree if a directory).
-	Filter func(path string, d fs.DirEntry) bool
-	// SkipErrors suppresses errors from the root lookup and doesn't call fn.
-	SkipErrors bool
-}
-
-// Walk walks the in-memory tree with optional WalkOptions.
-func (n *Node) Walk(root string, fn fs.WalkDirFunc, opts ...WalkOptions) error {
-	var opt WalkOptions
-	if len(opts) > 0 {
-		opt = opts[0]
-	}
-
-	if opt.SkipErrors {
-		// Check root exists — if not, silently skip.
-		if _, err := n.Stat(root); err != nil {
-			return nil
-		}
-	}
-
-	rootDepth := 0
-	if root != "." && root != "" {
-		rootDepth = strings.Count(root, "/") + 1
-	}
-
-	return fs.WalkDir(n, root, func(p string, d fs.DirEntry, err error) error {
-		if err != nil {
-			return fn(p, d, err)
-		}
-
-		// MaxDepth check.
-		if opt.MaxDepth > 0 {
-			depth := 0
-			if p != "." && p != "" {
-				depth = strings.Count(p, "/") + 1
-			}
-			if depth-rootDepth > opt.MaxDepth {
-				if d.IsDir() {
-					return fs.SkipDir
-				}
-				return nil
-			}
-		}
-
-		// Filter check.
-		if opt.Filter != nil && !opt.Filter(p, d) {
-			if d.IsDir() {
-				return fs.SkipDir
-			}
-			return nil
-		}
-
-		return fn(p, d, err)
-	})
-}
-
-// CopyFile copies a single file from the node to the OS filesystem.
-func (n *Node) CopyFile(src, dst string, perm os.FileMode) error {
-	src = strings.TrimPrefix(src, "/")
-	f, ok := n.files[src]
-	if !ok {
-		// Check if it's a directory — can't copy a directory as a file.
-		if info, err := n.Stat(src); err == nil && info.IsDir() {
-			return &fs.PathError{Op: "copyfile", Path: src, Err: fs.ErrInvalid}
-		}
-		return &fs.PathError{Op: "copyfile", Path: src, Err: fs.ErrNotExist}
-	}
-
-	dir := path.Dir(dst)
-	if dir != "." {
-		if err := os.MkdirAll(dir, 0755); err != nil {
-			return err
-		}
-	}
-
-	return os.WriteFile(dst, f.content, perm)
-}
-
 // CopyTo copies a file (or directory tree) from the node to any Medium.
 func (n *Node) CopyTo(target coreio.Medium, sourcePath, destPath string) error {
 	sourcePath = strings.TrimPrefix(sourcePath, "/")
@@ -330,20 +247,6 @@ func (n *Node) ReadDir(name string) ([]fs.DirEntry, error) {
 	return entries, nil
 }
 
-// ReadFile returns the content of a file as a byte slice.
-// Implements fs.ReadFileFS.
-func (n *Node) ReadFile(name string) ([]byte, error) {
-	name = strings.TrimPrefix(name, "/")
-	f, ok := n.files[name]
-	if !ok {
-		return nil, fs.ErrNotExist
-	}
-	// Return a copy to prevent mutation of internal state.
-	out := make([]byte, len(f.content))
-	copy(out, f.content)
-	return out, nil
-}
-
 // ---------- Medium interface: read/write ----------
 
 // Read retrieves the content of a file as a string.

pkg/io/node/node_test.go

@@ -243,21 +243,33 @@ func TestExists_Good(t *testing.T) {
 	n.AddData("foo.txt", []byte("foo"))
 	n.AddData("bar/baz.txt", []byte("baz"))
 
-	assert.True(t, n.Exists("foo.txt"))
+	exists, err := n.Exists("foo.txt")
-	assert.True(t, n.Exists("bar"))
+	require.NoError(t, err)
+	assert.True(t, exists)
+
+	exists, err = n.Exists("bar")
+	require.NoError(t, err)
+	assert.True(t, exists)
 }
 
 func TestExists_Bad(t *testing.T) {
 	n := New()
-	assert.False(t, n.Exists("nonexistent"))
+	exists, err := n.Exists("nonexistent")
+	require.NoError(t, err)
+	assert.False(t, exists)
 }
 
 func TestExists_Ugly(t *testing.T) {
 	n := New()
 	n.AddData("dummy.txt", []byte("dummy"))
 
-	assert.True(t, n.Exists("."), "root '.' must exist")
+	exists, err := n.Exists(".")
-	assert.True(t, n.Exists(""), "empty path (root) must exist")
+	require.NoError(t, err)
+	assert.True(t, exists, "root '.' must exist")
+
+	exists, err = n.Exists("")
+	require.NoError(t, err)
+	assert.True(t, exists, "empty path (root) must exist")
 }
 
 // ---------------------------------------------------------------------------
@@ -451,19 +463,20 @@ func TestFromTar_Good(t *testing.T) {
 	}
 	require.NoError(t, tw.Close())
 
-	n := New()
+	n, err := FromTar(buf.Bytes())
-	err := n.FromTar(buf.Bytes())
 	require.NoError(t, err)
 
-	assert.True(t, n.Exists("foo.txt"), "foo.txt should exist")
+	exists, _ := n.Exists("foo.txt")
-	assert.True(t, n.Exists("bar/baz.txt"), "bar/baz.txt should exist")
+	assert.True(t, exists, "foo.txt should exist")
+
+	exists, _ = n.Exists("bar/baz.txt")
+	assert.True(t, exists, "bar/baz.txt should exist")
 }
 
 func TestFromTar_Bad(t *testing.T) {
 	// Truncated data that cannot be a valid tar.
 	truncated := make([]byte, 100)
-	n := New()
+	_, err := FromTar(truncated)
-	err := n.FromTar(truncated)
 	assert.Error(t, err, "truncated data should produce an error")
 }
 
@@ -475,8 +488,7 @@ func TestTarRoundTrip_Good(t *testing.T) {
 	tarball, err := n1.ToTar()
 	require.NoError(t, err)
 
-	n2 := New()
+	n2, err := FromTar(tarball)
-	err = n2.FromTar(tarball)
 	require.NoError(t, err)
 
 	// Verify n2 matches n1.

pkg/manifest/loader.go

@@ -0,0 +1,43 @@
+package manifest
+
+import (
+	"crypto/ed25519"
+	"fmt"
+	"path/filepath"
+
+	"forge.lthn.ai/core/go/pkg/io"
+	"gopkg.in/yaml.v3"
+)
+
+const manifestPath = ".core/view.yml"
+
+// marshalYAML serializes a manifest to YAML bytes.
+func marshalYAML(m *Manifest) ([]byte, error) {
+	return yaml.Marshal(m)
+}
+
+// Load reads and parses a .core/view.yml from the given root directory.
+func Load(medium io.Medium, root string) (*Manifest, error) {
+	path := filepath.Join(root, manifestPath)
+	data, err := medium.Read(path)
+	if err != nil {
+		return nil, fmt.Errorf("manifest.Load: %w", err)
+	}
+	return Parse([]byte(data))
+}
+
+// LoadVerified reads, parses, and verifies the ed25519 signature.
+func LoadVerified(medium io.Medium, root string, pub ed25519.PublicKey) (*Manifest, error) {
+	m, err := Load(medium, root)
+	if err != nil {
+		return nil, err
+	}
+	ok, err := Verify(m, pub)
+	if err != nil {
+		return nil, fmt.Errorf("manifest.LoadVerified: %w", err)
+	}
+	if !ok {
+		return nil, fmt.Errorf("manifest.LoadVerified: signature verification failed for %q", m.Code)
+	}
+	return m, nil
+}

pkg/manifest/loader_test.go

@@ -0,0 +1,63 @@
+package manifest
+
+import (
+	"crypto/ed25519"
+	"testing"
+
+	"forge.lthn.ai/core/go/pkg/io"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestLoad_Good(t *testing.T) {
+	fs := io.NewMockMedium()
+	fs.Files[".core/view.yml"] = `
+code: test-app
+name: Test App
+version: 1.0.0
+layout: HLCRF
+slots:
+  C: main-content
+`
+	m, err := Load(fs, ".")
+	require.NoError(t, err)
+	assert.Equal(t, "test-app", m.Code)
+	assert.Equal(t, "main-content", m.Slots["C"])
+}
+
+func TestLoad_Bad_NoManifest(t *testing.T) {
+	fs := io.NewMockMedium()
+	_, err := Load(fs, ".")
+	assert.Error(t, err)
+}
+
+func TestLoadVerified_Good(t *testing.T) {
+	pub, priv, _ := ed25519.GenerateKey(nil)
+	m := &Manifest{
+		Code: "signed-app", Name: "Signed", Version: "1.0.0",
+		Layout: "HLCRF", Slots: map[string]string{"C": "main"},
+	}
+	_ = Sign(m, priv)
+
+	raw, _ := marshalYAML(m)
+	fs := io.NewMockMedium()
+	fs.Files[".core/view.yml"] = string(raw)
+
+	loaded, err := LoadVerified(fs, ".", pub)
+	require.NoError(t, err)
+	assert.Equal(t, "signed-app", loaded.Code)
+}
+
+func TestLoadVerified_Bad_Tampered(t *testing.T) {
+	pub, priv, _ := ed25519.GenerateKey(nil)
+	m := &Manifest{Code: "app", Version: "1.0.0"}
+	_ = Sign(m, priv)
+
+	raw, _ := marshalYAML(m)
+	tampered := "code: evil\n" + string(raw)[6:]
+	fs := io.NewMockMedium()
+	fs.Files[".core/view.yml"] = tampered
+
+	_, err := LoadVerified(fs, ".", pub)
+	assert.Error(t, err)
+}

pkg/manifest/manifest.go

@@ -0,0 +1,50 @@
+package manifest
+
+import (
+	"fmt"
+
+	"gopkg.in/yaml.v3"
+)
+
+// Manifest represents a .core/view.yml application manifest.
+type Manifest struct {
+	Code    string            `yaml:"code"`
+	Name    string            `yaml:"name"`
+	Version string            `yaml:"version"`
+	Sign    string            `yaml:"sign"`
+	Layout  string            `yaml:"layout"`
+	Slots   map[string]string `yaml:"slots"`
+
+	Permissions Permissions `yaml:"permissions"`
+	Modules     []string    `yaml:"modules"`
+}
+
+// Permissions declares the I/O capabilities a module requires.
+type Permissions struct {
+	Read  []string `yaml:"read"`
+	Write []string `yaml:"write"`
+	Net   []string `yaml:"net"`
+	Run   []string `yaml:"run"`
+}
+
+// Parse decodes YAML bytes into a Manifest.
+func Parse(data []byte) (*Manifest, error) {
+	var m Manifest
+	if err := yaml.Unmarshal(data, &m); err != nil {
+		return nil, fmt.Errorf("manifest.Parse: %w", err)
+	}
+	return &m, nil
+}
+
+// SlotNames returns a deduplicated list of component names from slots.
+func (m *Manifest) SlotNames() []string {
+	seen := make(map[string]bool)
+	var names []string
+	for _, name := range m.Slots {
+		if !seen[name] {
+			seen[name] = true
+			names = append(names, name)
+		}
+	}
+	return names
+}

pkg/manifest/manifest_test.go

@@ -0,0 +1,65 @@
+package manifest
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestParse_Good(t *testing.T) {
+	raw := `
+code: photo-browser
+name: Photo Browser
+version: 0.1.0
+sign: dGVzdHNpZw==
+
+layout: HLCRF
+slots:
+  H: nav-breadcrumb
+  L: folder-tree
+  C: photo-grid
+  R: metadata-panel
+  F: status-bar
+
+permissions:
+  read: ["./photos/"]
+  write: []
+  net: []
+  run: []
+
+modules:
+  - core/media
+  - core/fs
+`
+	m, err := Parse([]byte(raw))
+	require.NoError(t, err)
+	assert.Equal(t, "photo-browser", m.Code)
+	assert.Equal(t, "Photo Browser", m.Name)
+	assert.Equal(t, "0.1.0", m.Version)
+	assert.Equal(t, "dGVzdHNpZw==", m.Sign)
+	assert.Equal(t, "HLCRF", m.Layout)
+	assert.Equal(t, "nav-breadcrumb", m.Slots["H"])
+	assert.Equal(t, "photo-grid", m.Slots["C"])
+	assert.Len(t, m.Permissions.Read, 1)
+	assert.Equal(t, "./photos/", m.Permissions.Read[0])
+	assert.Len(t, m.Modules, 2)
+}
+
+func TestParse_Bad(t *testing.T) {
+	_, err := Parse([]byte("not: valid: yaml: ["))
+	assert.Error(t, err)
+}
+
+func TestManifest_SlotNames_Good(t *testing.T) {
+	m := Manifest{
+		Slots: map[string]string{
+			"H": "nav-bar",
+			"C": "main-content",
+		},
+	}
+	names := m.SlotNames()
+	assert.Contains(t, names, "nav-bar")
+	assert.Contains(t, names, "main-content")
+	assert.Len(t, names, 2)
+}

pkg/manifest/sign.go

@@ -0,0 +1,43 @@
+package manifest
+
+import (
+	"crypto/ed25519"
+	"encoding/base64"
+	"fmt"
+
+	"gopkg.in/yaml.v3"
+)
+
+// signable returns the canonical bytes to sign (manifest without sign field).
+func signable(m *Manifest) ([]byte, error) {
+	tmp := *m
+	tmp.Sign = ""
+	return yaml.Marshal(&tmp)
+}
+
+// Sign computes the ed25519 signature and stores it in m.Sign (base64).
+func Sign(m *Manifest, priv ed25519.PrivateKey) error {
+	msg, err := signable(m)
+	if err != nil {
+		return fmt.Errorf("manifest.Sign: marshal: %w", err)
+	}
+	sig := ed25519.Sign(priv, msg)
+	m.Sign = base64.StdEncoding.EncodeToString(sig)
+	return nil
+}
+
+// Verify checks the ed25519 signature in m.Sign against the public key.
+func Verify(m *Manifest, pub ed25519.PublicKey) (bool, error) {
+	if m.Sign == "" {
+		return false, fmt.Errorf("manifest.Verify: no signature present")
+	}
+	sig, err := base64.StdEncoding.DecodeString(m.Sign)
+	if err != nil {
+		return false, fmt.Errorf("manifest.Verify: decode: %w", err)
+	}
+	msg, err := signable(m)
+	if err != nil {
+		return false, fmt.Errorf("manifest.Verify: marshal: %w", err)
+	}
+	return ed25519.Verify(pub, msg, sig), nil
+}

pkg/manifest/sign_test.go

@@ -0,0 +1,51 @@
+package manifest
+
+import (
+	"crypto/ed25519"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSignAndVerify_Good(t *testing.T) {
+	pub, priv, err := ed25519.GenerateKey(nil)
+	require.NoError(t, err)
+
+	m := &Manifest{
+		Code:    "test-app",
+		Name:    "Test App",
+		Version: "1.0.0",
+		Layout:  "HLCRF",
+		Slots:   map[string]string{"C": "main"},
+	}
+
+	err = Sign(m, priv)
+	require.NoError(t, err)
+	assert.NotEmpty(t, m.Sign)
+
+	ok, err := Verify(m, pub)
+	require.NoError(t, err)
+	assert.True(t, ok)
+}
+
+func TestVerify_Bad_Tampered(t *testing.T) {
+	pub, priv, _ := ed25519.GenerateKey(nil)
+	m := &Manifest{Code: "test-app", Version: "1.0.0"}
+	_ = Sign(m, priv)
+
+	m.Code = "evil-app" // tamper
+
+	ok, err := Verify(m, pub)
+	require.NoError(t, err)
+	assert.False(t, ok)
+}
+
+func TestVerify_Bad_Unsigned(t *testing.T) {
+	pub, _, _ := ed25519.GenerateKey(nil)
+	m := &Manifest{Code: "test-app"}
+
+	ok, err := Verify(m, pub)
+	assert.Error(t, err)
+	assert.False(t, ok)
+}

pkg/marketplace/marketplace.go

@@ -0,0 +1,67 @@
+package marketplace
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+)
+
+// Module is a marketplace entry pointing to a module's Git repo.
+type Module struct {
+	Code     string `json:"code"`
+	Name     string `json:"name"`
+	Repo     string `json:"repo"`
+	SignKey  string `json:"sign_key"`
+	Category string `json:"category"`
+}
+
+// Index is the root marketplace catalog.
+type Index struct {
+	Version    int      `json:"version"`
+	Modules    []Module `json:"modules"`
+	Categories []string `json:"categories"`
+}
+
+// ParseIndex decodes a marketplace index.json.
+func ParseIndex(data []byte) (*Index, error) {
+	var idx Index
+	if err := json.Unmarshal(data, &idx); err != nil {
+		return nil, fmt.Errorf("marketplace.ParseIndex: %w", err)
+	}
+	return &idx, nil
+}
+
+// Search returns modules matching the query in code, name, or category.
+func (idx *Index) Search(query string) []Module {
+	q := strings.ToLower(query)
+	var results []Module
+	for _, m := range idx.Modules {
+		if strings.Contains(strings.ToLower(m.Code), q) ||
+			strings.Contains(strings.ToLower(m.Name), q) ||
+			strings.Contains(strings.ToLower(m.Category), q) {
+			results = append(results, m)
+		}
+	}
+	return results
+}
+
+// ByCategory returns all modules in the given category.
+func (idx *Index) ByCategory(category string) []Module {
+	var results []Module
+	for _, m := range idx.Modules {
+		if m.Category == category {
+			results = append(results, m)
+		}
+	}
+	return results
+}
+
+// Find returns the module with the given code, or false if not found.
+func (idx *Index) Find(code string) (Module, bool) {
+	for _, m := range idx.Modules {
+		if m.Code == code {
+			return m, true
+		}
+	}
+	return Module{}, false
+}

pkg/marketplace/marketplace_test.go

@@ -0,0 +1,65 @@
+package marketplace
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseIndex_Good(t *testing.T) {
+	raw := `{
+		"version": 1,
+		"modules": [
+			{"code": "mining-xmrig", "name": "XMRig Miner", "repo": "https://forge.lthn.io/host-uk/mod-xmrig.git", "sign_key": "abc123", "category": "miner"},
+			{"code": "utils-cyberchef", "name": "CyberChef", "repo": "https://forge.lthn.io/host-uk/mod-cyberchef.git", "sign_key": "def456", "category": "utils"}
+		],
+		"categories": ["miner", "utils"]
+	}`
+	idx, err := ParseIndex([]byte(raw))
+	require.NoError(t, err)
+	assert.Equal(t, 1, idx.Version)
+	assert.Len(t, idx.Modules, 2)
+	assert.Equal(t, "mining-xmrig", idx.Modules[0].Code)
+}
+
+func TestSearch_Good(t *testing.T) {
+	idx := &Index{
+		Modules: []Module{
+			{Code: "mining-xmrig", Name: "XMRig Miner", Category: "miner"},
+			{Code: "utils-cyberchef", Name: "CyberChef", Category: "utils"},
+		},
+	}
+	results := idx.Search("miner")
+	assert.Len(t, results, 1)
+	assert.Equal(t, "mining-xmrig", results[0].Code)
+}
+
+func TestByCategory_Good(t *testing.T) {
+	idx := &Index{
+		Modules: []Module{
+			{Code: "a", Category: "miner"},
+			{Code: "b", Category: "utils"},
+			{Code: "c", Category: "miner"},
+		},
+	}
+	miners := idx.ByCategory("miner")
+	assert.Len(t, miners, 2)
+}
+
+func TestFind_Good(t *testing.T) {
+	idx := &Index{
+		Modules: []Module{
+			{Code: "mining-xmrig", Name: "XMRig"},
+		},
+	}
+	m, ok := idx.Find("mining-xmrig")
+	assert.True(t, ok)
+	assert.Equal(t, "XMRig", m.Name)
+}
+
+func TestFind_Bad_NotFound(t *testing.T) {
+	idx := &Index{}
+	_, ok := idx.Find("nope")
+	assert.False(t, ok)
+}

pkg/process/supervisor.go

@@ -1,470 +0,0 @@
-package process
-
-import (
-	"context"
-	"fmt"
-	"log/slog"
-	"sync"
-	"time"
-)
-
-// RestartPolicy configures automatic restart behaviour for supervised units.
-type RestartPolicy struct {
-	// Delay between restart attempts.
-	Delay time.Duration
-	// MaxRestarts is the maximum number of restarts before giving up.
-	// Use -1 for unlimited restarts.
-	MaxRestarts int
-}
-
-// DaemonSpec defines a long-running external process under supervision.
-type DaemonSpec struct {
-	// Name identifies this daemon (must be unique within the supervisor).
-	Name string
-	// RunOptions defines the command, args, dir, env.
-	RunOptions
-	// Restart configures automatic restart behaviour.
-	Restart RestartPolicy
-}
-
-// GoSpec defines a supervised Go function that runs in a goroutine.
-// The function should block until done or ctx is cancelled.
-type GoSpec struct {
-	// Name identifies this task (must be unique within the supervisor).
-	Name string
-	// Func is the function to supervise. It receives a context that is
-	// cancelled when the supervisor stops or the task is explicitly stopped.
-	// If it returns an error or panics, the supervisor restarts it
-	// according to the restart policy.
-	Func func(ctx context.Context) error
-	// Restart configures automatic restart behaviour.
-	Restart RestartPolicy
-}
-
-// DaemonStatus contains a snapshot of a supervised unit's state.
-type DaemonStatus struct {
-	Name         string        `json:"name"`
-	Type         string        `json:"type"` // "process" or "goroutine"
-	Running      bool          `json:"running"`
-	PID          int           `json:"pid,omitempty"`
-	RestartCount int           `json:"restartCount"`
-	LastStart    time.Time     `json:"lastStart"`
-	Uptime       time.Duration `json:"uptime"`
-	ExitCode     int           `json:"exitCode,omitempty"`
-}
-
-// supervisedUnit is the internal state for any supervised unit.
-type supervisedUnit struct {
-	name         string
-	unitType     string // "process" or "goroutine"
-	restart      RestartPolicy
-	restartCount int
-	lastStart    time.Time
-	running      bool
-	exitCode     int
-
-	// For process daemons
-	runOpts *RunOptions
-	proc    *Process
-
-	// For go functions
-	goFunc func(ctx context.Context) error
-
-	cancel context.CancelFunc
-	done   chan struct{} // closed when supervision goroutine exits
-	mu     sync.Mutex
-}
-
-func (u *supervisedUnit) status() DaemonStatus {
-	u.mu.Lock()
-	defer u.mu.Unlock()
-
-	var uptime time.Duration
-	if u.running && !u.lastStart.IsZero() {
-		uptime = time.Since(u.lastStart)
-	}
-
-	pid := 0
-	if u.proc != nil {
-		info := u.proc.Info()
-		pid = info.PID
-	}
-
-	return DaemonStatus{
-		Name:         u.name,
-		Type:         u.unitType,
-		Running:      u.running,
-		PID:          pid,
-		RestartCount: u.restartCount,
-		LastStart:    u.lastStart,
-		Uptime:       uptime,
-		ExitCode:     u.exitCode,
-	}
-}
-
-// ShutdownTimeout is the maximum time to wait for supervised units during shutdown.
-const ShutdownTimeout = 15 * time.Second
-
-// Supervisor manages long-running processes and goroutines with automatic restart.
-//
-// For external processes, it requires a Service instance.
-// For Go functions, no Service is needed.
-//
-//	sup := process.NewSupervisor(svc)
-//	sup.Register(process.DaemonSpec{
-//	    Name:    "worker",
-//	    RunOptions: process.RunOptions{Command: "worker", Args: []string{"--port", "8080"}},
-//	    Restart: process.RestartPolicy{Delay: 5 * time.Second, MaxRestarts: -1},
-//	})
-//	sup.RegisterFunc(process.GoSpec{
-//	    Name: "health-check",
-//	    Func: healthCheckLoop,
-//	    Restart: process.RestartPolicy{Delay: time.Second, MaxRestarts: -1},
-//	})
-//	sup.Start()
-//	defer sup.Stop()
-type Supervisor struct {
-	service *Service
-	units   map[string]*supervisedUnit
-	ctx     context.Context
-	cancel  context.CancelFunc
-	wg      sync.WaitGroup
-	mu      sync.RWMutex
-	started bool
-}
-
-// NewSupervisor creates a supervisor.
-// The Service parameter is optional (nil) if only supervising Go functions.
-func NewSupervisor(svc *Service) *Supervisor {
-	ctx, cancel := context.WithCancel(context.Background())
-	return &Supervisor{
-		service: svc,
-		units:   make(map[string]*supervisedUnit),
-		ctx:     ctx,
-		cancel:  cancel,
-	}
-}
-
-// Register adds an external process daemon for supervision.
-// Panics if no Service was provided to NewSupervisor.
-func (s *Supervisor) Register(spec DaemonSpec) {
-	if s.service == nil {
-		panic("process: Supervisor.Register requires a Service (use NewSupervisor with non-nil service)")
-	}
-
-	s.mu.Lock()
-	defer s.mu.Unlock()
-
-	opts := spec.RunOptions
-	s.units[spec.Name] = &supervisedUnit{
-		name:     spec.Name,
-		unitType: "process",
-		restart:  spec.Restart,
-		runOpts:  &opts,
-	}
-}
-
-// RegisterFunc adds a Go function for supervision.
-func (s *Supervisor) RegisterFunc(spec GoSpec) {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-
-	s.units[spec.Name] = &supervisedUnit{
-		name:     spec.Name,
-		unitType: "goroutine",
-		restart:  spec.Restart,
-		goFunc:   spec.Func,
-	}
-}
-
-// Start begins supervising all registered units.
-// Safe to call once — subsequent calls are no-ops.
-func (s *Supervisor) Start() {
-	s.mu.Lock()
-	if s.started {
-		s.mu.Unlock()
-		return
-	}
-	s.started = true
-	s.mu.Unlock()
-
-	s.mu.RLock()
-	for _, unit := range s.units {
-		s.startUnit(unit)
-	}
-	s.mu.RUnlock()
-}
-
-// startUnit launches the supervision goroutine for a single unit.
-func (s *Supervisor) startUnit(u *supervisedUnit) {
-	u.mu.Lock()
-	if u.running {
-		u.mu.Unlock()
-		return
-	}
-	u.running = true
-	u.lastStart = time.Now()
-
-	unitCtx, unitCancel := context.WithCancel(s.ctx)
-	u.cancel = unitCancel
-	u.done = make(chan struct{})
-	u.mu.Unlock()
-
-	s.wg.Add(1)
-	go func() {
-		defer s.wg.Done()
-		defer close(u.done)
-		s.superviseLoop(u, unitCtx)
-	}()
-
-	slog.Info("supervisor: started unit", "name", u.name, "type", u.unitType)
-}
-
-// superviseLoop is the core restart loop for a supervised unit.
-// ctx is the unit's own context, derived from s.ctx. Cancelling either
-// the supervisor or the unit's context exits this loop.
-func (s *Supervisor) superviseLoop(u *supervisedUnit, ctx context.Context) {
-	for {
-		// Check if this unit's context is cancelled (covers both
-		// supervisor shutdown and manual restart/stop)
-		select {
-		case <-ctx.Done():
-			u.mu.Lock()
-			u.running = false
-			u.mu.Unlock()
-			return
-		default:
-		}
-
-		// Run the unit with panic recovery
-		exitCode := s.runUnit(u, ctx)
-
-		// If context was cancelled during run, exit the loop
-		if ctx.Err() != nil {
-			u.mu.Lock()
-			u.running = false
-			u.mu.Unlock()
-			return
-		}
-
-		u.mu.Lock()
-		u.exitCode = exitCode
-		u.restartCount++
-		shouldRestart := u.restart.MaxRestarts < 0 || u.restartCount <= u.restart.MaxRestarts
-		delay := u.restart.Delay
-		count := u.restartCount
-		u.mu.Unlock()
-
-		if !shouldRestart {
-			slog.Warn("supervisor: unit reached max restarts",
-				"name", u.name,
-				"maxRestarts", u.restart.MaxRestarts,
-			)
-			u.mu.Lock()
-			u.running = false
-			u.mu.Unlock()
-			return
-		}
-
-		// Wait before restarting, or exit if context is cancelled
-		select {
-		case <-ctx.Done():
-			u.mu.Lock()
-			u.running = false
-			u.mu.Unlock()
-			return
-		case <-time.After(delay):
-			slog.Info("supervisor: restarting unit",
-				"name", u.name,
-				"restartCount", count,
-				"exitCode", exitCode,
-			)
-			u.mu.Lock()
-			u.lastStart = time.Now()
-			u.mu.Unlock()
-		}
-	}
-}
-
-// runUnit executes a single run of the unit, returning exit code.
-// Recovers from panics.
-func (s *Supervisor) runUnit(u *supervisedUnit, ctx context.Context) (exitCode int) {
-	defer func() {
-		if r := recover(); r != nil {
-			slog.Error("supervisor: unit panicked",
-				"name", u.name,
-				"panic", fmt.Sprintf("%v", r),
-			)
-			exitCode = 1
-		}
-	}()
-
-	switch u.unitType {
-	case "process":
-		return s.runProcess(u, ctx)
-	case "goroutine":
-		return s.runGoFunc(u, ctx)
-	default:
-		slog.Error("supervisor: unknown unit type", "name", u.name, "type", u.unitType)
-		return 1
-	}
-}
-
-// runProcess starts an external process and waits for it to exit.
-func (s *Supervisor) runProcess(u *supervisedUnit, ctx context.Context) int {
-	proc, err := s.service.StartWithOptions(ctx, *u.runOpts)
-	if err != nil {
-		slog.Error("supervisor: failed to start process",
-			"name", u.name,
-			"error", err,
-		)
-		return 1
-	}
-
-	u.mu.Lock()
-	u.proc = proc
-	u.mu.Unlock()
-
-	// Wait for process to finish or context cancellation
-	select {
-	case <-proc.Done():
-		info := proc.Info()
-		return info.ExitCode
-	case <-ctx.Done():
-		// Context cancelled — kill the process
-		_ = proc.Kill()
-		<-proc.Done()
-		return -1
-	}
-}
-
-// runGoFunc runs a Go function and returns 0 on success, 1 on error.
-func (s *Supervisor) runGoFunc(u *supervisedUnit, ctx context.Context) int {
-	if err := u.goFunc(ctx); err != nil {
-		if ctx.Err() != nil {
-			// Context was cancelled, not a real error
-			return -1
-		}
-		slog.Error("supervisor: go function returned error",
-			"name", u.name,
-			"error", err,
-		)
-		return 1
-	}
-	return 0
-}
-
-// Stop gracefully shuts down all supervised units.
-func (s *Supervisor) Stop() {
-	s.cancel()
-
-	// Wait with timeout
-	done := make(chan struct{})
-	go func() {
-		s.wg.Wait()
-		close(done)
-	}()
-
-	select {
-	case <-done:
-		slog.Info("supervisor: all units stopped")
-	case <-time.After(ShutdownTimeout):
-		slog.Warn("supervisor: shutdown timeout, some units may not have stopped")
-	}
-
-	s.mu.Lock()
-	s.started = false
-	s.mu.Unlock()
-}
-
-// Restart stops and restarts a specific unit by name.
-func (s *Supervisor) Restart(name string) error {
-	s.mu.RLock()
-	u, ok := s.units[name]
-	s.mu.RUnlock()
-
-	if !ok {
-		return fmt.Errorf("supervisor: unit not found: %s", name)
-	}
-
-	// Cancel the current run and wait for the supervision goroutine to exit
-	u.mu.Lock()
-	if u.cancel != nil {
-		u.cancel()
-	}
-	done := u.done
-	u.mu.Unlock()
-
-	// Wait for the old supervision goroutine to exit
-	if done != nil {
-		<-done
-	}
-
-	// Reset restart counter for the fresh start
-	u.mu.Lock()
-	u.restartCount = 0
-	u.mu.Unlock()
-
-	// Start fresh
-	s.startUnit(u)
-	return nil
-}
-
-// StopUnit stops a specific unit without restarting it.
-func (s *Supervisor) StopUnit(name string) error {
-	s.mu.RLock()
-	u, ok := s.units[name]
-	s.mu.RUnlock()
-
-	if !ok {
-		return fmt.Errorf("supervisor: unit not found: %s", name)
-	}
-
-	u.mu.Lock()
-	if u.cancel != nil {
-		u.cancel()
-	}
-	// Set max restarts to 0 to prevent the loop from restarting
-	u.restart.MaxRestarts = 0
-	u.restartCount = 1
-	u.mu.Unlock()
-
-	return nil
-}
-
-// Status returns the status of a specific supervised unit.
-func (s *Supervisor) Status(name string) (DaemonStatus, error) {
-	s.mu.RLock()
-	u, ok := s.units[name]
-	s.mu.RUnlock()
-
-	if !ok {
-		return DaemonStatus{}, fmt.Errorf("supervisor: unit not found: %s", name)
-	}
-
-	return u.status(), nil
-}
-
-// Statuses returns the status of all supervised units.
-func (s *Supervisor) Statuses() map[string]DaemonStatus {
-	s.mu.RLock()
-	defer s.mu.RUnlock()
-
-	result := make(map[string]DaemonStatus, len(s.units))
-	for name, u := range s.units {
-		result[name] = u.status()
-	}
-	return result
-}
-
-// UnitNames returns the names of all registered units.
-func (s *Supervisor) UnitNames() []string {
-	s.mu.RLock()
-	defer s.mu.RUnlock()
-
-	names := make([]string, 0, len(s.units))
-	for name := range s.units {
-		names = append(names, name)
-	}
-	return names
-}

pkg/process/supervisor_test.go

@@ -1,335 +0,0 @@
-package process
-
-import (
-	"context"
-	"fmt"
-	"sync/atomic"
-	"testing"
-	"time"
-)
-
-func TestSupervisor_GoFunc_Good(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	var count atomic.Int32
-	sup.RegisterFunc(GoSpec{
-		Name: "counter",
-		Func: func(ctx context.Context) error {
-			count.Add(1)
-			<-ctx.Done()
-			return nil
-		},
-		Restart: RestartPolicy{Delay: 10 * time.Millisecond, MaxRestarts: -1},
-	})
-
-	sup.Start()
-	time.Sleep(50 * time.Millisecond)
-
-	status, err := sup.Status("counter")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if !status.Running {
-		t.Error("expected counter to be running")
-	}
-	if status.Type != "goroutine" {
-		t.Errorf("expected type goroutine, got %s", status.Type)
-	}
-
-	sup.Stop()
-
-	if c := count.Load(); c < 1 {
-		t.Errorf("expected counter >= 1, got %d", c)
-	}
-}
-
-func TestSupervisor_GoFunc_Restart_Good(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	var runs atomic.Int32
-	sup.RegisterFunc(GoSpec{
-		Name: "crasher",
-		Func: func(ctx context.Context) error {
-			n := runs.Add(1)
-			if n <= 3 {
-				return fmt.Errorf("crash #%d", n)
-			}
-			// After 3 crashes, stay running
-			<-ctx.Done()
-			return nil
-		},
-		Restart: RestartPolicy{Delay: 5 * time.Millisecond, MaxRestarts: -1},
-	})
-
-	sup.Start()
-	// Wait for restarts
-	time.Sleep(200 * time.Millisecond)
-
-	status, _ := sup.Status("crasher")
-	if status.RestartCount < 3 {
-		t.Errorf("expected at least 3 restarts, got %d", status.RestartCount)
-	}
-	if !status.Running {
-		t.Error("expected crasher to be running after recovering")
-	}
-
-	sup.Stop()
-}
-
-func TestSupervisor_GoFunc_MaxRestarts_Good(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	sup.RegisterFunc(GoSpec{
-		Name: "limited",
-		Func: func(ctx context.Context) error {
-			return fmt.Errorf("always fail")
-		},
-		Restart: RestartPolicy{Delay: 5 * time.Millisecond, MaxRestarts: 2},
-	})
-
-	sup.Start()
-	time.Sleep(200 * time.Millisecond)
-
-	status, _ := sup.Status("limited")
-	if status.Running {
-		t.Error("expected limited to have stopped after max restarts")
-	}
-	// The function runs once (initial) + 2 restarts = restartCount should be 3
-	// (restartCount increments each time the function exits)
-	if status.RestartCount > 3 {
-		t.Errorf("expected restartCount <= 3, got %d", status.RestartCount)
-	}
-
-	sup.Stop()
-}
-
-func TestSupervisor_GoFunc_Panic_Good(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	var runs atomic.Int32
-	sup.RegisterFunc(GoSpec{
-		Name: "panicker",
-		Func: func(ctx context.Context) error {
-			n := runs.Add(1)
-			if n == 1 {
-				panic("boom")
-			}
-			<-ctx.Done()
-			return nil
-		},
-		Restart: RestartPolicy{Delay: 5 * time.Millisecond, MaxRestarts: 3},
-	})
-
-	sup.Start()
-	time.Sleep(100 * time.Millisecond)
-
-	status, _ := sup.Status("panicker")
-	if !status.Running {
-		t.Error("expected panicker to recover and be running")
-	}
-	if runs.Load() < 2 {
-		t.Error("expected at least 2 runs (1 panic + 1 recovery)")
-	}
-
-	sup.Stop()
-}
-
-func TestSupervisor_Statuses_Good(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	sup.RegisterFunc(GoSpec{
-		Name: "a",
-		Func: func(ctx context.Context) error { <-ctx.Done(); return nil },
-		Restart: RestartPolicy{MaxRestarts: -1},
-	})
-	sup.RegisterFunc(GoSpec{
-		Name: "b",
-		Func: func(ctx context.Context) error { <-ctx.Done(); return nil },
-		Restart: RestartPolicy{MaxRestarts: -1},
-	})
-
-	sup.Start()
-	time.Sleep(50 * time.Millisecond)
-
-	statuses := sup.Statuses()
-	if len(statuses) != 2 {
-		t.Errorf("expected 2 statuses, got %d", len(statuses))
-	}
-	if !statuses["a"].Running || !statuses["b"].Running {
-		t.Error("expected both units running")
-	}
-
-	sup.Stop()
-}
-
-func TestSupervisor_UnitNames_Good(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	sup.RegisterFunc(GoSpec{
-		Name: "alpha",
-		Func: func(ctx context.Context) error { <-ctx.Done(); return nil },
-	})
-	sup.RegisterFunc(GoSpec{
-		Name: "beta",
-		Func: func(ctx context.Context) error { <-ctx.Done(); return nil },
-	})
-
-	names := sup.UnitNames()
-	if len(names) != 2 {
-		t.Errorf("expected 2 names, got %d", len(names))
-	}
-}
-
-func TestSupervisor_Status_Bad(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	_, err := sup.Status("nonexistent")
-	if err == nil {
-		t.Error("expected error for nonexistent unit")
-	}
-}
-
-func TestSupervisor_Restart_Good(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	var runs atomic.Int32
-	sup.RegisterFunc(GoSpec{
-		Name: "restartable",
-		Func: func(ctx context.Context) error {
-			runs.Add(1)
-			<-ctx.Done()
-			return nil
-		},
-		Restart: RestartPolicy{Delay: 5 * time.Millisecond, MaxRestarts: -1},
-	})
-
-	sup.Start()
-	time.Sleep(50 * time.Millisecond)
-
-	if err := sup.Restart("restartable"); err != nil {
-		t.Fatal(err)
-	}
-	time.Sleep(100 * time.Millisecond)
-
-	if runs.Load() < 2 {
-		t.Errorf("expected at least 2 runs after restart, got %d", runs.Load())
-	}
-
-	sup.Stop()
-}
-
-func TestSupervisor_Restart_Bad(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	err := sup.Restart("nonexistent")
-	if err == nil {
-		t.Error("expected error for nonexistent unit")
-	}
-}
-
-func TestSupervisor_StopUnit_Good(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	sup.RegisterFunc(GoSpec{
-		Name: "stoppable",
-		Func: func(ctx context.Context) error {
-			<-ctx.Done()
-			return nil
-		},
-		Restart: RestartPolicy{Delay: 5 * time.Millisecond, MaxRestarts: -1},
-	})
-
-	sup.Start()
-	time.Sleep(50 * time.Millisecond)
-
-	if err := sup.StopUnit("stoppable"); err != nil {
-		t.Fatal(err)
-	}
-	time.Sleep(100 * time.Millisecond)
-
-	status, _ := sup.Status("stoppable")
-	if status.Running {
-		t.Error("expected unit to be stopped")
-	}
-
-	sup.Stop()
-}
-
-func TestSupervisor_StopUnit_Bad(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	err := sup.StopUnit("nonexistent")
-	if err == nil {
-		t.Error("expected error for nonexistent unit")
-	}
-}
-
-func TestSupervisor_StartIdempotent_Good(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	var count atomic.Int32
-	sup.RegisterFunc(GoSpec{
-		Name: "once",
-		Func: func(ctx context.Context) error {
-			count.Add(1)
-			<-ctx.Done()
-			return nil
-		},
-	})
-
-	sup.Start()
-	sup.Start() // Should be no-op
-	sup.Start() // Should be no-op
-
-	time.Sleep(50 * time.Millisecond)
-
-	if count.Load() != 1 {
-		t.Errorf("expected exactly 1 run, got %d", count.Load())
-	}
-
-	sup.Stop()
-}
-
-func TestSupervisor_NoRestart_Good(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	var runs atomic.Int32
-	sup.RegisterFunc(GoSpec{
-		Name: "oneshot",
-		Func: func(ctx context.Context) error {
-			runs.Add(1)
-			return nil // Exit immediately
-		},
-		Restart: RestartPolicy{Delay: 5 * time.Millisecond, MaxRestarts: 0},
-	})
-
-	sup.Start()
-	time.Sleep(100 * time.Millisecond)
-
-	status, _ := sup.Status("oneshot")
-	if status.Running {
-		t.Error("expected oneshot to not be running")
-	}
-	// Should run once (initial) then stop. restartCount will be 1
-	// (incremented after the initial run exits).
-	if runs.Load() != 1 {
-		t.Errorf("expected exactly 1 run, got %d", runs.Load())
-	}
-
-	sup.Stop()
-}
-
-func TestSupervisor_Register_Ugly(t *testing.T) {
-	sup := NewSupervisor(nil)
-
-	defer func() {
-		if r := recover(); r == nil {
-			t.Error("expected panic when registering process daemon without service")
-		}
-	}()
-
-	sup.Register(DaemonSpec{
-		Name:       "will-panic",
-		RunOptions: RunOptions{Command: "echo"},
-	})
-}

pkg/store/store.go

@@ -0,0 +1,124 @@
+package store
+
+import (
+	"database/sql"
+	"fmt"
+	"strings"
+	"text/template"
+
+	_ "modernc.org/sqlite"
+)
+
+// Store is a group-namespaced key-value store backed by SQLite.
+type Store struct {
+	db *sql.DB
+}
+
+// New creates a Store at the given SQLite path. Use ":memory:" for tests.
+func New(dbPath string) (*Store, error) {
+	db, err := sql.Open("sqlite", dbPath)
+	if err != nil {
+		return nil, fmt.Errorf("store.New: %w", err)
+	}
+	if _, err := db.Exec("PRAGMA journal_mode=WAL"); err != nil {
+		db.Close()
+		return nil, fmt.Errorf("store.New: WAL: %w", err)
+	}
+	if _, err := db.Exec(`CREATE TABLE IF NOT EXISTS kv (
+		grp   TEXT NOT NULL,
+		key   TEXT NOT NULL,
+		value TEXT NOT NULL,
+		PRIMARY KEY (grp, key)
+	)`); err != nil {
+		db.Close()
+		return nil, fmt.Errorf("store.New: schema: %w", err)
+	}
+	return &Store{db: db}, nil
+}
+
+// Close closes the underlying database.
+func (s *Store) Close() error {
+	return s.db.Close()
+}
+
+// Get retrieves a value by group and key.
+func (s *Store) Get(group, key string) (string, error) {
+	var val string
+	err := s.db.QueryRow("SELECT value FROM kv WHERE grp = ? AND key = ?", group, key).Scan(&val)
+	if err == sql.ErrNoRows {
+		return "", fmt.Errorf("store.Get: not found: %s/%s", group, key)
+	}
+	if err != nil {
+		return "", fmt.Errorf("store.Get: %w", err)
+	}
+	return val, nil
+}
+
+// Set stores a value by group and key, overwriting if exists.
+func (s *Store) Set(group, key, value string) error {
+	_, err := s.db.Exec(
+		`INSERT INTO kv (grp, key, value) VALUES (?, ?, ?)
+		 ON CONFLICT(grp, key) DO UPDATE SET value = excluded.value`,
+		group, key, value,
+	)
+	if err != nil {
+		return fmt.Errorf("store.Set: %w", err)
+	}
+	return nil
+}
+
+// Delete removes a single key from a group.
+func (s *Store) Delete(group, key string) error {
+	_, err := s.db.Exec("DELETE FROM kv WHERE grp = ? AND key = ?", group, key)
+	if err != nil {
+		return fmt.Errorf("store.Delete: %w", err)
+	}
+	return nil
+}
+
+// Count returns the number of keys in a group.
+func (s *Store) Count(group string) (int, error) {
+	var n int
+	err := s.db.QueryRow("SELECT COUNT(*) FROM kv WHERE grp = ?", group).Scan(&n)
+	if err != nil {
+		return 0, fmt.Errorf("store.Count: %w", err)
+	}
+	return n, nil
+}
+
+// DeleteGroup removes all keys in a group.
+func (s *Store) DeleteGroup(group string) error {
+	_, err := s.db.Exec("DELETE FROM kv WHERE grp = ?", group)
+	if err != nil {
+		return fmt.Errorf("store.DeleteGroup: %w", err)
+	}
+	return nil
+}
+
+// Render loads all key-value pairs from a group and renders a Go template.
+func (s *Store) Render(tmplStr, group string) (string, error) {
+	rows, err := s.db.Query("SELECT key, value FROM kv WHERE grp = ?", group)
+	if err != nil {
+		return "", fmt.Errorf("store.Render: query: %w", err)
+	}
+	defer rows.Close()
+
+	vars := make(map[string]string)
+	for rows.Next() {
+		var k, v string
+		if err := rows.Scan(&k, &v); err != nil {
+			return "", fmt.Errorf("store.Render: scan: %w", err)
+		}
+		vars[k] = v
+	}
+
+	tmpl, err := template.New("render").Parse(tmplStr)
+	if err != nil {
+		return "", fmt.Errorf("store.Render: parse: %w", err)
+	}
+	var b strings.Builder
+	if err := tmpl.Execute(&b, vars); err != nil {
+		return "", fmt.Errorf("store.Render: exec: %w", err)
+	}
+	return b.String(), nil
+}

pkg/store/store_test.go

@@ -0,0 +1,81 @@
+package store
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSetGet_Good(t *testing.T) {
+	s, err := New(":memory:")
+	require.NoError(t, err)
+	defer s.Close()
+
+	err = s.Set("config", "theme", "dark")
+	require.NoError(t, err)
+
+	val, err := s.Get("config", "theme")
+	require.NoError(t, err)
+	assert.Equal(t, "dark", val)
+}
+
+func TestGet_Bad_NotFound(t *testing.T) {
+	s, _ := New(":memory:")
+	defer s.Close()
+
+	_, err := s.Get("config", "missing")
+	assert.Error(t, err)
+}
+
+func TestDelete_Good(t *testing.T) {
+	s, _ := New(":memory:")
+	defer s.Close()
+
+	_ = s.Set("config", "key", "val")
+	err := s.Delete("config", "key")
+	require.NoError(t, err)
+
+	_, err = s.Get("config", "key")
+	assert.Error(t, err)
+}
+
+func TestCount_Good(t *testing.T) {
+	s, _ := New(":memory:")
+	defer s.Close()
+
+	_ = s.Set("grp", "a", "1")
+	_ = s.Set("grp", "b", "2")
+	_ = s.Set("other", "c", "3")
+
+	n, err := s.Count("grp")
+	require.NoError(t, err)
+	assert.Equal(t, 2, n)
+}
+
+func TestDeleteGroup_Good(t *testing.T) {
+	s, _ := New(":memory:")
+	defer s.Close()
+
+	_ = s.Set("grp", "a", "1")
+	_ = s.Set("grp", "b", "2")
+	err := s.DeleteGroup("grp")
+	require.NoError(t, err)
+
+	n, _ := s.Count("grp")
+	assert.Equal(t, 0, n)
+}
+
+func TestRender_Good(t *testing.T) {
+	s, _ := New(":memory:")
+	defer s.Close()
+
+	_ = s.Set("user", "pool", "pool.lthn.io:3333")
+	_ = s.Set("user", "wallet", "iz...")
+
+	tmpl := `{"pool":"{{ .pool }}","wallet":"{{ .wallet }}"}`
+	out, err := s.Render(tmpl, "user")
+	require.NoError(t, err)
+	assert.Contains(t, out, "pool.lthn.io:3333")
+	assert.Contains(t, out, "iz...")
+}