d5f0b6d63a
Fixes #21070. This is a small cleanup around model metadata handling for gateway/provider model names. It follows the report and proposed direction from @dkbush by keeping the fallback metadata warning useful without repeating it every turn, and by tightening the existing provider-prefix lookup path. - Track fallback metadata warning slugs in session state so each unresolved model warns once per session. - Keep warning emission outside the session-state lock and preserve the existing warning text. - Allow one-segment provider prefixes with hyphenated provider IDs, while preserving the multi-segment rejection behavior. - Add focused coverage for warning dedupe and hyphenated provider-prefix metadata matching. Testing: - Ran `just fmt`. - Ran `git diff --check`. - Added tests for the new warning dedupe and provider-prefix lookup behavior.
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