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+# Lint
+
+Module: `forge.lthn.ai/core/lint`
+Binary: `core-lint`
+
+Pattern-based lint tool for Go, PHP, TypeScript, JavaScript, Python, and C++. Rules are defined in embedded YAML catalog files with regex detection, severity levels, and auto-fix suggestions. Includes Go AST cyclomatic complexity analysis, test coverage tracking, govulncheck integration, and a full PHP quality pipeline (Pint, PHPStan, Psalm, security auditing, mutation testing).
+
+## Architecture
+
+The lint engine has three layers:
+
+1. **Catalog** — YAML rule files loaded from embedded filesystem or external paths.
+2. **Matcher** — Compiled regex rules applied line-by-line to source files.
+3. **Scanner** — Directory walker that detects file languages and dispatches to matcher.
+
+## Key Types
+
+### Rule
+
+```go
+type Rule struct {
+    ID             string   // unique identifier
+    Title          string   // human-readable name
+    Severity       string   // info, low, medium, high, critical
+    Languages      []string // target languages (go, php, ts, js, cpp, py)
+    Tags           []string // categorisation tags
+    Pattern        string   // regex or AST pattern
+    ExcludePattern string   // lines/files matching this are skipped
+    Fix            string   // suggested fix description
+    Detection      string   // "regex" or "ast"
+    AutoFixable    bool     // whether automatic fix is possible
+    ExampleBad     string   // bad code example
+    ExampleGood    string   // good code example
+}
+```
+
+`Validate()` checks required fields and compiles regex patterns.
+
+### Finding
+
+```go
+type Finding struct {
+    RuleID   string
+    Title    string
+    Severity string
+    File     string
+    Line     int
+    Match    string
+    Fix      string
+    Repo     string
+}
+```
+
+### Matcher
+
+Holds compiled rules. `NewMatcher(rules) (*Matcher, error)` compiles regex-detection rules. `Match(filename, content) []Finding` scans line-by-line, checking exclude patterns on both lines and filenames.
+
+### Scanner
+
+`NewScanner(rules) (*Scanner, error)` creates a scanner with default directory exclusions (vendor, node_modules, .git, testdata, .core).
+
+- `ScanDir(root) ([]Finding, error)` — walks directory tree, detects language by extension, matches rules.
+- `ScanFile(path) ([]Finding, error)` — scans single file.
+
+Language detection: `.go`->go, `.php`->php, `.ts/.tsx`->ts, `.js/.jsx`->js, `.cpp/.cc/.c/.h`->cpp, `.py`->py.
+
+### Catalog
+
+`LoadFS(fs, dir) (*Catalog, error)` loads rules from embedded or external filesystem. `LoadEmbeddedCatalog()` loads from `catalog/*.yaml`.
+
+Shipped catalogs:
+- `go-correctness.yaml`
+- `go-modernise.yaml`
+- `go-security.yaml`
+
+## Additional Packages
+
+### pkg/lint/
+
+| File | Description |
+|------|-------------|
+| complexity.go | Go AST cyclomatic complexity analysis |
+| coverage.go | Test coverage snapshot, regression tracking |
+| vulncheck.go | govulncheck JSON output parsing |
+| tools.go | Toolkit subprocess wrappers (external tools) |
+| report.go | Output formatting (JSON, JSONL, text) |
+
+### pkg/detect/
+
+Project type detection: `Detect(path) string` identifies project type from files present (go.mod, composer.json, package.json, etc.).
+
+### pkg/php/
+
+Full PHP quality pipeline:
+
+| File | Description |
+|------|-------------|
+| format.go | Laravel Pint code formatting |
+| analyse.go | PHPStan + Psalm static analysis |
+| audit.go | Composer security auditing |
+| security.go | Security checks |
+| test.go | Pest/PHPUnit test runner |
+| refactor.go | Rector refactoring |
+| mutation.go | Infection mutation testing |
+| pipeline.go | Orchestrated QA pipeline |
+| runner.go | Pipeline execution engine |
+
+## CLI
+
+Entry point: `cmd/core-lint/`. Also `cmd/qa/` for quality assurance commands.
+
+## Dependencies
+
+Direct: `core/cli`, `go-i18n`, `go-io`, `go-log`, `go-scm`, `testify`, `yaml.v3`.
+
+## Usage
+
+```go
+catalog, _ := lint.LoadEmbeddedCatalog()
+scanner, _ := lint.NewScanner(catalog.Rules())
+findings, _ := scanner.ScanDir("./src")
+```