## Why
Piping `codex plugin list` into a consumer such as `head` can close stdout before the full catalog is written, causing a panic.
## What changed
Write both table and JSON output through a fallible writer and treat broken pipes during writing or flushing as success. Continue propagating other output errors.
## Testing
Add unit tests for write and flush failures in both output formats, plus CLI tests that close stdout early and verify a successful exit without a panic.
GitOrigin-RevId: cc4a64e10ad723d26b6de9e731efdc534dbee492