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## Summary
This PR improves `js_repl` crash diagnostics so kernel failures are
debuggable without weakening timeout/reset guarantees.
## What Changed
- Added bounded kernel stderr capture and truncation logic (line + byte
caps).
- Added structured kernel snapshots (`pid`, exit status, stderr tail)
for failure paths.
- Enriched model-visible kernel-failure errors with a structured
diagnostics payload:
- `js_repl diagnostics: {...}`
- Included only for likely kernel-failure write/EOF cases.
- Improved logging around kernel write failures, unexpected exits, and
kill/wait paths.
- Added/updated unit tests for:
- UTF-8-safe truncation
- stderr tail bounds
- structured diagnostics shape/truncation
- conditional diagnostics emission
- timeout kill behavior
- forced kernel-failure diagnostics
## Why
Before this, failures like broken pipe / unexpected kernel exit often
surfaced as generic errors with little context. This change preserves
existing behavior but adds actionable diagnostics while keeping output
bounded.
## Scope
- Code changes are limited to:
-
`/Users/fjord/code/codex-jsrepl-seq/codex-rs/core/src/tools/js_repl/mod.rs`
## Validation
- `cargo clippy -p codex-core --all-targets -- -D warnings`
- Targeted `codex-core` js_repl unit tests (including new
diagnostics/timeout coverage)
- Tried starting a long running js_repl command (sleep for 10 minutes),
verified error output was as expected after killing the node process.
#### [git stack](https://github.com/magus/git-stack-cli)
- 👉 `1` https://github.com/openai/codex/pull/11666
- ⏳ `2` https://github.com/openai/codex/pull/10673
- ⏳ `3` https://github.com/openai/codex/pull/10670
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