feat(build): disable commitlint subject-case rule and add clean-dist script

- Disable subject-case rule in commitlint to allow capital letters in commit subjects
- Add clean-dist.js script to preserve UI bundle during TypeScript builds
- Update package.json prebuild script to use new clean-dist.js

commitlint.config.cjs

@@ -17,8 +17,8 @@ module.exports = {
       'build',    // Build system → no release
       'revert'    // Revert commit → PATCH
     ]],
-    // Subject must be lowercase
-    'subject-case': [2, 'always', 'lower-case'],
+    // Subject case - disabled to allow capital letters
+    'subject-case': [0],
     // Max header length (type + scope + subject)
     'header-max-length': [2, 'always', 100]
   }

package.json

@@ -54,7 +54,7 @@
     "build:watch": "tsc --watch",
     "build:server": "tsc && node scripts/add-shebang.js",
     "build:all": "bun run ui:build && bun run build:server",
-    "prebuild": "rm -rf dist tsconfig.tsbuildinfo",
+    "prebuild": "node scripts/clean-dist.js",
     "prebuild:all": "rm -rf dist tsconfig.tsbuildinfo",
     "postbuild:all": "node scripts/verify-bundle.js",
     "typecheck": "tsc --noEmit",

scripts/clean-dist.js

@@ -0,0 +1,46 @@
+#!/usr/bin/env node
+
+/**
+ * Clean dist directory while preserving UI bundle
+ * The UI bundle is built separately and should not be deleted during regular builds
+ */
+
+const fs = require('fs');
+const path = require('path');
+
+const DIST_DIR = path.join(__dirname, '../dist');
+const TSCONFIG_BUILDINFO = path.join(__dirname, '../tsconfig.tsbuildinfo');
+
+// Directories to preserve (from UI build)
+const PRESERVE = new Set(['ui']);
+
+function cleanDist() {
+  // Remove tsconfig.tsbuildinfo
+  if (fs.existsSync(TSCONFIG_BUILDINFO)) {
+    fs.unlinkSync(TSCONFIG_BUILDINFO);
+  }
+
+  // If dist doesn't exist, nothing to clean
+  if (!fs.existsSync(DIST_DIR)) {
+    return;
+  }
+
+  const entries = fs.readdirSync(DIST_DIR, { withFileTypes: true });
+
+  for (const entry of entries) {
+    // Skip preserved directories
+    if (PRESERVE.has(entry.name)) {
+      continue;
+    }
+
+    const fullPath = path.join(DIST_DIR, entry.name);
+
+    if (entry.isDirectory()) {
+      fs.rmSync(fullPath, { recursive: true, force: true });
+    } else {
+      fs.unlinkSync(fullPath);
+    }
+  }
+}
+
+cleanDist();