build: replace husky with lefthook for git hooks (#123)

Author: DivMode

.gitignore

@@ -35,3 +35,4 @@ coverage
 *.env
 .worktrees/
 .claude/
+lefthook-local.yml

.husky/commit-msg

@@ -0,0 +1,26 @@
+commit-msg:
+  commands:
+    conventional-commit:
+      run: |
+        MSG=$(grep -v '^#' "{1}" | head -1)
+        if [ -z "$MSG" ]; then exit 0; fi
+        PATTERN='^(feat|fix|docs|style|refactor|perf|test|build|ci|chore|revert)(\(.+\))?: .+'
+        if ! echo "$MSG" | grep -qE "$PATTERN"; then
+          echo ""
+          echo "  Bad commit message: $MSG"
+          echo ""
+          echo "  Must match: <type>(<scope>): <description>"
+          echo ""
+          echo "  Types: feat fix docs style refactor perf test build ci chore revert"
+          echo "  Examples:"
+          echo "    feat: add shadow DOM diagnostics"
+          echo "    fix(solver): resolve WS leak race"
+          echo "    chore: update dependencies"
+          echo ""
+          exit 1
+        fi
+
+pre-push:
+  commands:
+    test:
+      run: npx vitest run

.husky/pre-push

@@ -41,7 +41,7 @@
     "test:integration": "vitest run --project=integration",
     "coverage": "npm run build:ts && c8 --reporter=text --reporter=html --reporter=lcov cross-env DEBUG=quiet mocha",
     "start": "env-cmd -f .env bun build",
-    "prepare": "husky || true"
+    "prepare": "lefthook install"
   },
   "files": [
     "assets/*",
@@ -195,7 +195,7 @@
   "devDependencies": {
     "@effect/vitest": "4.0.0-beta.31",
     "env-cmd": "^11.0.0",
-    "husky": "^9.1.7",
+    "lefthook": "^1.11.13",
     "vitest": "^4.0.18"
   }
 }