Updated all package references from @zilliz/claude-context-core and
@zilliz/claude-context-mcp to @stonecodelabs/claude-context-core and
@stonecodelabs/claude-context-mcp respectively.

Changes include:
- Source files (handlers.ts, extension.ts, commands, etc.)
- TypeScript paths in tsconfig.json
- Webpack aliases in webpack.config.js
- All documentation files (README.md, CONTRIBUTING.md, etc.)
- GitHub workflow file (release.yml)
- Example files
- Regenerated pnpm-lock.yaml

Note: @zilliz/milvus2-sdk-node references are preserved as this is
the official Milvus SDK, not our package.

🤖 Generated with [Claude Code](https://claude.com/claude-code

)

Co-Authored-By: Claude <noreply@anthropic.com>