tercerapersona 3b4763b3f9 feat: add Anthropic prompt caching via cache_control
Inject cache_control: {"type": "ephemeral"} on the system message and
last tool definition for providers that support prompt caching. Adds
supports_prompt_caching flag to ProviderSpec (enabled for Anthropic only)
and skips caching when routing through a gateway.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-02-19 11:05:22 -03:00
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