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/core/src/session/turn_context.rs

@@ -177,13 +177,9 @@ impl TurnContext {
     }
 
     pub(crate) fn effective_reasoning_effort(&self) -> Option<ReasoningEffortConfig> {
-        if self.model_info.supports_reasoning_summaries {
-            self.reasoning_effort
-                .clone()
-                .or_else(|| self.model_info.default_reasoning_level.clone())
-        } else {
-            None
-        }
+        self.reasoning_effort
+            .clone()
+            .or_else(|| self.model_info.default_reasoning_level.clone())
     }
 
     pub(crate) fn effective_reasoning_effort_for_tracing(&self) -> String {