refactor: Remove semantic search and vector embedding functionality

Removes @xenova/transformers dependency, vector storage tables, embedding generation, and semantic search APIs. Simplifies context building to use only FTS search. Eliminates visualizer server, postinstall model download, and related CLI commands. Reduces package size and complexity while maintaining core static analysis capabilities.

package.json

@@ -14,9 +14,8 @@
   ],
   "scripts": {
     "build": "tsc && npm run copy-assets",
-    "postinstall": "node scripts/postinstall.js",
     "preuninstall": "node dist/bin/uninstall.js",
-    "copy-assets": "node -e \"const fs=require('fs');fs.mkdirSync('dist/db',{recursive:true});fs.copyFileSync('src/db/schema.sql','dist/db/schema.sql');fs.mkdirSync('dist/extraction/wasm',{recursive:true});fs.readdirSync('src/extraction/wasm').filter(f=>f.endsWith('.wasm')).forEach(f=>fs.copyFileSync('src/extraction/wasm/'+f,'dist/extraction/wasm/'+f));fs.mkdirSync('dist/visualizer/public',{recursive:true});fs.copyFileSync('src/visualizer/public/index.html','dist/visualizer/public/index.html')\"",
+    "copy-assets": "node -e \"const fs=require('fs');fs.mkdirSync('dist/db',{recursive:true});fs.copyFileSync('src/db/schema.sql','dist/db/schema.sql');fs.mkdirSync('dist/extraction/wasm',{recursive:true});fs.readdirSync('src/extraction/wasm').filter(f=>f.endsWith('.wasm')).forEach(f=>fs.copyFileSync('src/extraction/wasm/'+f,'dist/extraction/wasm/'+f))\"",
     "dev": "tsc --watch",
     "cli": "npm run build && node dist/bin/codegraph.js",
     "test": "vitest run",
@@ -28,14 +27,12 @@
   "keywords": [
     "code-intelligence",
     "knowledge-graph",
-    "static-analysis",
-    "semantic-search"
+    "static-analysis"
   ],
   "author": "",
   "license": "MIT",
   "dependencies": {
     "@clack/prompts": "^1.2.0",
-    "@xenova/transformers": "^2.17.0",
     "commander": "^14.0.2",
     "node-sqlite3-wasm": "^0.8.30",
     "picomatch": "^4.0.3",
@@ -50,8 +47,7 @@
     "vitest": "^2.1.9"
   },
   "optionalDependencies": {
-    "better-sqlite3": "^11.0.0",
-    "sqlite-vss": "^0.1.2"
+    "better-sqlite3": "^11.0.0"
   },
   "engines": {
     "node": ">=18.0.0 <25.0.0"