docs(06-02): complete event codegen plan

- SUMMARY.md with codegen tool details and verification results - STATE.md updated with position, decisions, session context - ROADMAP.md progress: Phase 6 at 2/3 plans - REQUIREMENTS.md: QUAL-02 marked complete
2026-03-04 19:25:57 -05:00
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+---
+phase: 06-sql-consolidation-code-quality
+plan: 02
+subsystem: codegen
+tags: [go-ast, codegen, typescript, go-generate, lefthook]
+
+# Dependency graph
+requires: []
+provides:
+  - Go→TypeScript event constant generator (genevents)
+  - go:generate directive for automatic event sync
+  - LibraryConfigChanged gap automatically fixed
+  - Pre-commit codegen-check hook covers event constants
+affects: [frontend, backend-events]
+
+# Tech tracking
+tech-stack:
+  added: [go/ast, go/parser, go/token]
+  patterns: [AST-based codegen for cross-language constant sync, atomic file writes via temp+rename]
+
+key-files:
+  created:
+    - backend/events/cmd/genevents/main.go
+  modified:
+    - backend/events/events.go
+    - frontend/src/events.ts
+
+key-decisions:
+  - "Iterate f.Decls directly (not map) for deterministic declaration-order output"
+  - "Strip trailing period from Go doc comments for cleaner TypeScript comments"
+  - "Atomic writes via temp file + os.Rename to prevent partial output"
+
+patterns-established:
+  - "Cross-language constant sync: Go source of truth → go/ast parser → TypeScript codegen"
+  - "go:generate directive per package with relative paths to output"
+
+requirements-completed: [QUAL-02]
+
+# Metrics
+duration: 2min
+completed: 2026-03-05
+---
+
+# Phase 06 Plan 02: Event Codegen Summary
+
+**Go→TypeScript event constant generator using go/ast, fixing LibraryConfigChanged gap and wiring pre-commit drift detection**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-03-05T00:20:57Z
+- **Completed:** 2026-03-05T00:23:43Z
+- **Tasks:** 2
+- **Files modified:** 3
+
+## Accomplishments
+- Built `genevents` codegen tool parsing Go AST for deterministic TypeScript output
+- Fixed missing `LibraryConfigChanged` constant — now automatically generated from Go source
+- Verified codegen-check pre-commit hook detects drift when Go constants change without regenerating TS
+- All 21 event constants synced between Go and TypeScript, frontend typecheck passes
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create event codegen tool** - `3e9edd0` (feat)
+2. **Task 2: Wire codegen-check pre-commit hook** - No changes needed (lefthook.yml already correctly configured; task was verification-only)
+
+## Files Created/Modified
+- `backend/events/cmd/genevents/main.go` - Go→TypeScript event constant generator using go/ast
+- `backend/events/events.go` - Added `//go:generate` directive for automatic codegen
+- `frontend/src/events.ts` - Regenerated with all 21 constants including LibraryConfigChanged
+
+## Decisions Made
+- Iterated `f.Decls` directly (not collected into map) for deterministic declaration-order output
+- Stripped trailing periods from Go doc comments for cleaner TypeScript comments
+- Used atomic writes (temp file + `os.Rename`) to prevent partial output on failure
+- No lefthook.yml changes needed — existing `codegen-check` hook already runs `go generate ./...` which now includes the event generator
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Event codegen complete, ready for remaining Phase 6 plans
+- Pre-commit hook validates all generated code (templ, sqlc, events) in <2 seconds
+
+## Self-Check: PASSED
+
+---
+*Phase: 06-sql-consolidation-code-quality*
+*Completed: 2026-03-05*