Scaffold widget package for @vibetechnologies/webagent

[OpenCodeEngineer]

Scaffold packages/widget with complete Preact chat widget implementation, agent loop, tools, WebMCP, session persistence, and build config per specification.

[OpenCodeEngineer]

Implemented full scaffold for packages/widget with all requested files (build config, agent loop/types, knowledge/store/tools/webmcp, UI components, and polished styles).\n\nValidation run in packages/widget:\n- npm install ✅\n- npm run typecheck ✅\n- npm run build ✅\n- npm run test -- --run ⚠️ fails because no test files exist yet (Vitest exits 1 on empty suite).

[OpenCodeEngineer]

Scaffold implementation is complete and pushed in PR #5.\n\nStatus:\n- All requested files under packages/widget were created with complete implementations.\n- Local validation in packages/widget: typecheck and build succeed.\n- CI still fails at repository root due missing root package.json in current branch context (ERR_PNPM_NO_PKG_MANIFEST), which is outside widget package scope.

[OpenCodeEngineer]

Done.