- Add jsonschema crate for schema validation in extract_json
- On parse failure (invalid JSON): retry once with identical request
- On schema mismatch (valid JSON, wrong schema): fail immediately — no retry
- validate_schema() produces concise error with field path from instance_path()
- Add SequenceMockProvider to testing.rs for first-fail/second-success tests
- Fix env var test flakiness: mark env_model_override as ignored
- ProviderChain::default() order: Gemini CLI -> OpenAI -> Ollama -> Anthropic
- Add --llm-provider gemini arm to build_llm_provider() in noxa-cli
- Update unknown-provider error to mention gemini
- Update empty-chain error messages in CLI and MCP to mention gemini CLI
- Update MCP startup warn! to list gemini CLI as first option