sync: bug fixes + eval system from private repo

- Fix chunk_status: pass chunk_status/chunk/metadata to context builder
- Fix vector search: scope by node_id BEFORE similarity search
- Add eval logging system (RAH_EVALS_LOG=1)
- Add eval dashboard at /evals
- Add vitest for testing

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

package.json

@@ -15,7 +15,10 @@
     "type-check": "tsc --noEmit",
     "setup": "npm install",
     "sqlite:backup": "bash scripts/database/sqlite-backup.sh",
-    "sqlite:restore": "bash scripts/database/sqlite-restore.sh"
+    "sqlite:restore": "bash scripts/database/sqlite-restore.sh",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "evals": "RAH_EVALS_LOG=1 tsx tests/evals/runner.ts"
   },
   "dependencies": {
     "@ai-sdk/anthropic": "^2.0.27",
@@ -62,6 +65,8 @@
     "prettier": "^3.3.3",
     "tailwindcss": "^3.4.17",
     "tailwindcss-animate": "^1.0.7",
-    "typescript": "^5.7.2"
+    "tsx": "^4.19.4",
+    "typescript": "^5.7.2",
+    "vitest": "^3.2.4"
   }
 }