v0.11.1

Patch release.

• fix(gemini): strip JSON Schema keywords Gemini rejects from tool parameters — v0.11.0's gemini provider sent tool schemas verbatim, and Gemini hard-rejects standard JSON Schema keywords like $schema and additionalProperties with a 400. The adapter now sanitizes tool parameters down to the OpenAPI-style subset Gemini accepts. Any agent using provider: gemini with tools needs this release.