Bump default @google/stitch-sdk pin from 0.1.1 to 0.3.5. Checked upstream (google-labs-code/stitch-sdk): the documented class surface (Stitch/Project/Screen/DesignSystem/StitchToolClient/StitchProxy) is unchanged between 0.1.1 and 0.3.5 - these were maintenance releases, not API changes. Also documents the toolMap/toolDefinitions static introspection export for offline tool discovery without an API key. Repo renamed from stitch-skills to stitch-skill.