- Generalized thinking loop guard and helper functions to support Gemini, DeepSeek, and Grok model families.
- Replaced `withGeminiThinkingLoopGuard` and related Gemini-specific symbols with generalized counterparts.
- Removed deprecated `enableGeminiThinkingLoopGuard` options and associated tests.
- Updated test suites and agent session logic to use the generalized thinking loop guard and model family tokens.
- Added comprehensive reference documentation for OpenAI compatibility flags, reasoning levels, and tool handling policies.
- Detailed provider-specific quirks covering stream handling, authentication, quotas, and catalog model behaviors.
- Updated provider endpoint constraints with cross-references to the new compatibility and quirks references.
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