fix(clean): remove .codemap from git clean exclusions

bun run clean now wipes local index state under .codemap/ for a true fresh tree; .env and docs/research/scratch/ stay preserved.

Author: SutuSebastian

.github/CONTRIBUTING.md

@@ -17,7 +17,7 @@ bun run test:golden   # golden SQL vs fixtures/minimal (also runs at end of `bun
 bun run test:agent-eval   # agent-eval harness smoke (probe + live; also runs at end of `bun run check`)
 bun run test:golden:external   # Tier B: local tree via CODEMAP_ROOT / --root (not in CI)
 bun run check   # build, then format:check + lint:ci + test + typecheck, then test:golden + test:agent-eval
-bun run clean   # remove untracked/ignored build artifacts (keeps `.env`, `.codemap/`, `docs/research/scratch/`)
+bun run clean   # remove untracked/ignored build artifacts (keeps `.env`, `docs/research/scratch/`; removes `.codemap/` index state)
 bun run check-updates   # interactive dependency updates (`bun update -i --latest`)
 ```
 

package.json

@@ -50,7 +50,7 @@
     "check-updates": "bun update -i --latest",
     "check:perf-baseline": "bun scripts/check-perf-baseline.ts",
     "check:perf-baseline:update": "bun scripts/check-perf-baseline.ts --update",
-    "clean": "git clean -xdf -e .env -e .codemap -e docs/research/scratch",
+    "clean": "git clean -xdf -e .env -e docs/research/scratch",
     "dev": "bun src/index.ts",
     "fix": "bun run lint:fix && bun run format",
     "format": "oxfmt",