Limit payload traces in diagnostic logs (#37497)

## Why

High-volume request and streamed-response payloads can overwhelm the SQLite log database and diagnostic ring buffer used for reports.

## What changed

- Limit HTTP transport, SSE, and WebSocket diagnostics to `DEBUG` in persistent log sinks while leaving unrelated trace diagnostics available.
- Log known unhandled response events and delta events at `TRACE`, and surface unexpected event kinds at `DEBUG` without including their payloads.
- Report structured parse-error metadata instead of logging an unparseable SSE payload.

## Testing

- Cover filtering for transport, SSE, WebSocket, and unrelated trace records in both report and SQLite log sinks.
- Cover unknown and unsupported delta response events.

GitOrigin-RevId: 6d9121e093ddadf6834da394df544d9c09d8aeb9

codex-rs/feedback/Cargo.toml

@@ -17,6 +17,7 @@ tracing = { workspace = true }
 tracing-subscriber = { workspace = true }
 
 [dev-dependencies]
+log = { workspace = true }
 pretty_assertions = { workspace = true }
 
 [lib]