chore: remove Taskfile, .core/build.yaml is the build config

All tasks were already wrappers around `core` commands.
Build configuration lives in .core/build.yaml.

Co-Authored-By: Virgil <virgil@lethean.io>

Taskfile.yml

@@ -1,165 +0,0 @@
-version: '3'
-
-vars:
-  # SemVer 2.0.0 build variables
-  SEMVER_TAG:
-    sh: git describe --tags --abbrev=0 2>/dev/null || echo "0.0.0"
-  SEMVER_VERSION:
-    sh: echo "{{.SEMVER_TAG}}" | sed 's/^v//'
-  SEMVER_COMMITS:
-    sh: git rev-list {{.SEMVER_TAG}}..HEAD --count 2>/dev/null || echo "0"
-  SEMVER_COMMIT:
-    sh: git rev-parse --short HEAD 2>/dev/null || echo "unknown"
-  SEMVER_DATE:
-    sh: date -u +%Y%m%d
-  SEMVER_PRERELEASE:
-    sh: '[ "{{.SEMVER_COMMITS}}" = "0" ] && echo "" || echo "dev.{{.SEMVER_COMMITS}}"'
-  # ldflags
-  PKG: "forge.lthn.ai/core/go/pkg/cli"
-  LDFLAGS_BASE: >-
-    -X {{.PKG}}.AppVersion={{.SEMVER_VERSION}}
-    -X {{.PKG}}.BuildCommit={{.SEMVER_COMMIT}}
-    -X {{.PKG}}.BuildDate={{.SEMVER_DATE}}
-    -X {{.PKG}}.BuildPreRelease={{.SEMVER_PRERELEASE}}
-  # Development build: includes debug info
-  LDFLAGS: "{{.LDFLAGS_BASE}}"
-  # Release build: strips debug info and symbol table for smaller binary
-  LDFLAGS_RELEASE: "-s -w {{.LDFLAGS_BASE}}"
-  # Compat alias
-  VERSION:
-    sh: git describe --tags --exact-match 2>/dev/null || echo "dev"
-
-tasks:
-  # --- CLI Management ---
-  cli:build:
-    desc: "Build core CLI to ./bin/core (dev build with debug info)"
-    cmds:
-      - go build -ldflags '{{.LDFLAGS}}' -o ./bin/core .
-
-  cli:build:release:
-    desc: "Build core CLI for release (smaller binary, no debug info)"
-    cmds:
-      - go build -ldflags '{{.LDFLAGS_RELEASE}}' -o ./bin/core .
-
-  cli:install:
-    desc: "Install core CLI to system PATH (dev build)"
-    cmds:
-      - go install -ldflags '{{.LDFLAGS}}' .
-
-  cli:install:release:
-    desc: "Install core CLI for release (smaller binary)"
-    cmds:
-      - go install -ldflags '{{.LDFLAGS_RELEASE}}' .
-
-  # --- Development ---
-  test:
-    desc: "Run all tests"
-    cmds:
-      - core test
-
-  test:verbose:
-    desc: "Run all tests with verbose output"
-    cmds:
-      - core test --verbose
-
-  test:run:
-    desc: "Run specific test (use: task test:run -- TestName)"
-    cmds:
-      - core test --run {{.CLI_ARGS}}
-
-  cov:
-    desc: "Run tests with coverage report"
-    cmds:
-      - core go cov
-
-  cov-view:
-    desc: "Open HTML coverage report"
-    cmds:
-      - core go cov --open
-
-  fmt:
-    desc: "Format Go code"
-    cmds:
-      - core go fmt
-
-  lint:
-    desc: "Run linter"
-    cmds:
-      - core go lint
-
-  mod:tidy:
-    desc: "Run go mod tidy"
-    cmds:
-      - core go mod tidy
-
-  # --- Quality Assurance ---
-  qa:
-    desc: "Run QA: fmt, vet, lint, test"
-    cmds:
-      - core go qa
-
-  qa:quick:
-    desc: "Quick QA: fmt, vet, lint only"
-    cmds:
-      - core go qa quick
-
-  qa:full:
-    desc: "Full QA: + race, vuln, security"
-    cmds:
-      - core go qa full
-
-  qa:fix:
-    desc: "QA with auto-fix"
-    cmds:
-      - core go qa --fix
-
-  # --- Build ---
-  build:
-    desc: "Build project with auto-detection"
-    cmds:
-      - core build
-
-  build:ci:
-    desc: "Build for CI (all targets, checksums)"
-    cmds:
-      - core build --ci
-
-  # --- Environment ---
-  doctor:
-    desc: "Check development environment"
-    cmds:
-      - core doctor
-
-  doctor:verbose:
-    desc: "Check environment with details"
-    cmds:
-      - core doctor --verbose
-
-  # --- Code Review ---
-  review:
-    desc: "Run CodeRabbit review"
-    cmds:
-      - coderabbit review --prompt-only
-
-  check:
-    desc: "Tidy, test, and review"
-    cmds:
-      - task: mod:tidy
-      - task: test
-      - task: review
-
-  # --- Multi-repo (when in workspace) ---
-  dev:health:
-    desc: "Check health of all repos"
-    cmds:
-      - core dev health
-
-  dev:work:
-    desc: "Full workflow: status, commit, push"
-    cmds:
-      - core dev work
-
-  dev:status:
-    desc: "Show status of all repos"
-    cmds:
-      - core dev work --status