Add benchmark results and tests for LSP graph builder and staged search

- Introduced a new benchmark results file for performance comparison on 2026-02-09.
- Added a test for LspGraphBuilder to ensure it does not expand nodes at maximum depth.
- Created a test for the staged search pipeline to validate fallback behavior when stage 1 returns empty results.

package.json

@@ -60,6 +60,8 @@
     "node-pty": "^1.1.0-beta21",
     "open": "^9.1.0",
     "ora": "^7.0.0",
+    "tree-sitter-wasms": "^0.1.13",
+    "web-tree-sitter": "^0.24.0",
     "zod": "^4.1.13"
   },
   "files": [