* docs(docs): add agent guidance and repository instructions
- Created `AGENTS.md` and `CLAUDE.md` to provide high-signal guidance for AI agents and developers working in the repository.
- Outlined critical developer commands for building, testing, and running diagnostics using `bun`.
- Documented the repository architecture, source entrypoints, and core service logic.
- Defined framework-specific quirks, including module stubbing for internal modules and macro versioning.
- Established style and workflow guidelines regarding telemetry, environment variables, and security scan requirements.
* feat(api): support gemini thought signatures in openai shim
- Added `isGeminiMode` utility to detect Gemini backends via `CLAUDE_CODE_USE_GEMINI` or `OPENAI_BASE_URL`.
- Updated `convertMessages` to extract `thought_signature` from thinking blocks and inject them into tool calls.
- Implemented a fallback mechanism that provides a `skip_thought_signature_validator` string to avoid 400 validation errors when a signature is missing.
- Enhanced `openaiStreamToAnthropic` and `OpenAIShimMessages` to correctly preserve and pass through Gemini-specific metadata in `extra_content`.
* refactor(api): improve gemini metadata handling and remove redundant docs
- Updated `src/services/api/openaiShim.ts` to merge existing `google`-specific metadata within `extra_content` instead of overwriting it.
- Simplified the `thought_signature` assignment logic to use a fallback value of `skip_thought_signature_validator` when no signature is provided.
- Deleted `AGENTS.md` and `CLAUDE.md` files to eliminate redundant agent guidance documentation.
* fix(api): propagate gemini thought signatures to all parallel tool calls
- Removed the index constraint when assigning the `signature` from a `thinkingBlock` to tool calls in `openaiShim.ts`.
- Ensured that the `thought_signature` is applied to every tool call in a parallel set, rather than just the first one.
- Aligned the shim with Gemini API requirements, which mandate that the same signature must be present on every replayed function call part within an assistant turn.
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