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-lock.json

@@ -27,6 +27,8 @@
         "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"
       },
       "bin": {
@@ -25844,6 +25846,15 @@
         "tree-kill": "cli.js"
       }
     },
+    "node_modules/tree-sitter-wasms": {
+      "version": "0.1.13",
+      "resolved": "https://registry.npmjs.org/tree-sitter-wasms/-/tree-sitter-wasms-0.1.13.tgz",
+      "integrity": "sha512-wT+cR6DwaIz80/vho3AvSF0N4txuNx/5bcRKoXouOfClpxh/qqrF4URNLQXbbt8MaAxeksZcZd1j8gcGjc+QxQ==",
+      "license": "Unlicense",
+      "dependencies": {
+        "tree-sitter-wasms": "^0.1.11"
+      }
+    },
     "node_modules/trim-lines": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/trim-lines/-/trim-lines-3.0.1.tgz",
@@ -28411,6 +28422,12 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/web-tree-sitter": {
+      "version": "0.24.0",
+      "resolved": "https://registry.npmjs.org/web-tree-sitter/-/web-tree-sitter-0.24.0.tgz",
+      "integrity": "sha512-NZWxfjayD1NlO4klbaR7ohHTp67uBjYC/y7pr+aaiqdpAbRHvmSs30f6O562E6YrwaZwFVu38HIA7GDmuxgtUg==",
+      "license": "MIT"
+    },
     "node_modules/web-vitals": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/web-vitals/-/web-vitals-5.1.0.tgz",