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Closes #38220 --- Users calling `create_agent(..., response_format=<schema>)` with an OpenAI model pinned to a dated snapshot (e.g. `gpt-5.4-2026-03-05`) were silently downgraded from native structured output (`ProviderStrategy`) to tool-calling (`ToolStrategy`). This changes runtime behavior: extra tool-call traces, different token usage, and no provider-side schema enforcement. The cause is in `_supports_provider_strategy`'s fallback patterns: the `gpt-5.2` and `gpt-5.4` base patterns terminated with `($|[/:])`, which — unlike their sibling families — rejected a trailing `-`, so OpenAI's `-YYYY-MM-DD` dated-snapshot suffix matched none of the patterns. The base patterns were deliberately strict to keep `gpt-5.2-pro`/`gpt-5.4-pro` blocked, so rather than allowing any trailing `-` (which would re-admit those `-pro` variants) this change adds an optional dated-snapshot group `(-\d{4}-\d{2}-\d{2})?`. Dated snapshots now resolve to `ProviderStrategy` while `-pro` variants stay blocked. Made by [Open SWE](https://openswe.vercel.app/agents/c5ebcb29-8ce5-dda0-73f6-198e49f0c36c) Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>