Step 8: Polish — lint, clock abstraction, e2e test.

- golangci-lint config with errcheck, govet, staticcheck, errorlint
- Fix all lint issues (unchecked error returns in cleanup paths, De Morgan)
- Inject jonboulle/clockwork into Garden for deterministic timestamps
- Add manifest.NewWithTime() for clock-aware initialization
- E2e lifecycle test: init → add → checkpoint → modify → status → restore → verify
- Update CLAUDE.md, PROJECT_PLAN.md, PROGRESS.md

Phase 1 (local) is now complete. All 9 CLI commands implemented and tested.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

PROJECT_PLAN.md

@@ -86,11 +86,11 @@ Depends on Step 5.
 
 ## Step 8: Polish
 
-- [ ] Lint setup (golangci-lint config)
-- [ ] Clock abstraction: inject `jonboulle/clockwork` into Garden for deterministic timestamp tests
-- [ ] End-to-end test: init → add → checkpoint → modify file → status → restore → verify
-- [ ] Ensure `go vet ./...` and `go test ./...` pass clean
-- [ ] Update CLAUDE.md, ARCHITECTURE.md, PROGRESS.md
+- [x] Lint setup (golangci-lint config)
+- [x] Clock abstraction: inject `jonboulle/clockwork` into Garden for deterministic timestamp tests
+- [x] End-to-end test: init → add → checkpoint → modify file → status → restore → verify
+- [x] Ensure `go vet ./...` and `go test ./...` pass clean
+- [x] Update CLAUDE.md, ARCHITECTURE.md, PROGRESS.md
 
 ## Future Steps (Not Phase 1)