* 💰 feat: Add gpt-5.3 context window and pricing
* 💰 feat: Add OpenAI cached input pricing and `gpt-5.2-pro` model
- Add cached input pricing (write/read) for gpt-4o, gpt-4.1, gpt-5.x,
o1, o3, o4-mini models with correct per-family discount tiers
- Add gpt-5.2-pro pricing ($21/$168), context window, and max output
- Pro models (gpt-5-pro, gpt-5.2-pro) correctly excluded from cache
pricing as OpenAI does not support caching for these
* 🔍 fix: Address review findings for OpenAI pricing
- Add o1-preview to cacheTokenValues (50% discount, same as o1)
- Fix comment to enumerate all models per discount tier
- Add cache tests for dated variants (gpt-4o-2024-08-06, etc.)
- Add gpt-5-mini/gpt-5-nano to 10% ratio invariant test
- Replace forEach with for...of in new test code
- Fix inconsistent test description phrasing
- Add gpt-5.3-preview to context window tests
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