Always send reasoning parameters in Responses requests (#32206)

## What changed

- Build a reasoning payload for every Responses request and always include `reasoning.encrypted_content`.
- Remove `supports_reasoning_summaries` from model metadata and retire the `model_supports_reasoning_summaries` configuration override.
- Use configured or model-default reasoning effort without a capability gate, including for guardian reviews and tracing.

GitOrigin-RevId: 2c9f194a5d2d4d688a2235299e6358f82ab8e1ea

codex-rs/model-provider/src/provider.rs

@@ -421,7 +421,6 @@ mod tests {
             "priority": 0,
             "upgrade": null,
             "base_instructions": "base instructions",
-            "supports_reasoning_summaries": false,
             "support_verbosity": false,
             "default_verbosity": null,
             "apply_patch_tool_type": null,