revert: remove codebase intelligence system

Rolled back the intel system due to overengineering concerns:
- 1200+ line hook with SQLite graph database
- 21MB sql.js dependency
- Entity generation spawning additional Claude calls
- Complex system with unclear value

Removed:
- /gsd:analyze-codebase command
- /gsd:query-intel command
- gsd-intel-index.js, gsd-intel-session.js, gsd-intel-prune.js hooks
- gsd-entity-generator, gsd-indexer agents
- entity.md template
- sql.js dependency

Preserved:
- Model profiles feature
- Statusline hook
- All other v1.9.x improvements

-3,065 lines removed

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -36,8 +36,7 @@
   },
   "dependencies": {},
   "devDependencies": {
-    "esbuild": "^0.24.0",
-    "sql.js": "^1.12.0"
+    "esbuild": "^0.24.0"
   },
   "scripts": {
     "build:hooks": "node scripts/build-hooks.js",