jif a7dcd20d38 Add process diagnostics snapshots (#37434) ...

## What changed

- Add a `codex-diagnostics` crate that snapshots the process ID, available
  resident-memory measurements, and registered process-wide gauges.
- Provide guards that update gauges for the lifetime of measured objects.
- Track live `CodexThread` instances with the `core.threads.live` gauge.

## Testing

- Add unit coverage for gauge registration, guard lifetimes, process memory
  snapshots, and live-thread reporting.

GitOrigin-RevId: 3236b086bd4ebe31ed4768ab87a5fa288b0891b0

2026-08-07 11:30:17 +00:00

..

src

Add process diagnostics snapshots (#37434)

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BUILD.bazel

Add process diagnostics snapshots (#37434)

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Cargo.toml

Add process diagnostics snapshots (#37434)

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