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Atish PatelandClaude Opus 4.8 fb4a727a50 feat(agent): add Gemini as a first-class LLM provider

Adds `gemini` as a first-class buzz-agent provider using Google's
OpenAI-compatible surface, so it reuses the existing Chat Completions
request/response path rather than introducing a second serializer/parser.

Provider contract (RESEARCH/GEMINI_PROVIDER_API_CONTRACT.md):
- Provider id `gemini`; env vars `GEMINI_API_KEY`, `GEMINI_MODEL`, optional
  `GEMINI_BASE_URL` (default https://generativelanguage.googleapis.com/v1beta/openai).
- Static `Authorization: Bearer $GEMINI_API_KEY`; `/models` discovery reuses the
  OpenAI-compatible path with the same bearer and key-redacted errors.
- API shape pinned to Chat Completions — never Responses or native
  generateContent (there is no /responses endpoint on the Google host).

Changes:
- buzz-agent config.rs: `Provider::Gemini` variant, `resolve_provider` +
  `from_env` arms reading GEMINI_* with the Google default base URL, API pinned
  to Chat. Extracted `GEMINI_DEFAULT_BASE_URL` constant.
- buzz-agent llm.rs: route Gemini through the OpenAI Chat arms and the static
  bearer token source. Extracted `should_use_responses` so a Chat-pinned
  provider can never be routed to /responses regardless of host/auto-upgrade.
- desktop agent_models.rs: provider-aware base-URL/key resolution so `/models`
  discovery reads GEMINI_BASE_URL/GEMINI_API_KEY; Gemini ids pass through the
  OpenAI text-model filter unchanged.
- desktop readiness.rs: require GEMINI_API_KEY and accept GEMINI_MODEL fallback.
- frontend personaDialogPickers.tsx: provider option, credential mapping, and
  explicit-model requirement.

Tests: new coverage in config.rs, llm.rs, agent_models_tests.rs, readiness.rs,
and editAgentProviderDiscovery.test.mjs. Full local gates green: buzz-agent +
desktop Tauri unit tests, desktop TS tests, typecheck, biome, clippy
(workspace + Tauri), rustfmt.

Co-authored-by: Atish Patel <atish@squareup.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Atish Patel <atish@squareup.com>

2026-07-19 18:13:30 -05:00