Owen Lin 7bddb3083d fix(app-server): thread history redaction for remote clients (#22178)
## Summary

Remote clients can still receive large `thread/resume` histories when
prior turns include MCP tool call payloads or image-generation results.
This adds a temporary response-only redaction path for the known remote
client names.

Longer term we will move towards fully paginated APIs backed by SQLite.

## Changes

- Redact MCP tool call payload-bearing fields in `thread/resume`
responses for `codex_chatgpt_android_remote` and
`codex_chatgpt_ios_remote`.
- Drop `imageGeneration` items from those `thread/resume` responses.
- Keep redaction out of persisted rollout files, `thread/read`,
`thread/turns/list`, live notifications, and token usage replay.
- Cover the behavior with app-server helper tests and a v2 resume
integration test that checks both remote clients plus a non-target
control client.

## Testing

- `cargo test -p codex-app-server thread_resume_redaction`
- `cargo test -p codex-app-server
thread_resume_redacts_payloads_for_chatgpt_remote_clients`
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