The published .vsix excluded node_modules/ via .vscodeignore but had no bundler, causing 'Cannot find module vscode-languageclient/node' on activation. - Add esbuild to bundle src/extension.ts into dist/extension.js - Migrate extension from plain JS to strict TypeScript - Modernize from deprecated client.onReady() to v9 async pattern (register notifications before await client.start()) - Update CI to run build + verification before vsce package - Update local dev workflow (scripts/link/vscode, docs)