Route hook MCP calls through current connections (#39331)

## What changed

- Execute hook-triggered MCP calls through the runtime's latest connection set instead of preparing a separate catalog-bound call.
- Keep hook calls from waiting for server startup or reconnecting, and reject disconnected servers immediately.
- Apply the shorter of the hook-requested timeout and the server's configured tool timeout.

## Testing

- Update connection manager tests to cover non-waiting calls and disabled tool filters.

GitOrigin-RevId: 3166b2d1e26d9ae2b8b3a648b4d0897cc260eb93

codex-rs/core/src/session/mod.rs

@@ -3594,6 +3594,8 @@ impl Session {
                     Some(serde_json::json!({
                         "threadId": self.thread_id().to_string(),
                     })),
+                    /*requested_timeout*/ None,
+                    /*wait_for_server*/ true,
                 )
                 .await
                 .ok()