* Update canonical debugger, import and Windows regression coverage
Preserve existing RustPython test adaptations through update_lib and refresh consumed translation snapshots.
Assisted-by: OpenAI Codex: model version unavailable
* Sync canonical comprehension regression expectations
Retire upstream-removed genexpr and list-comprehension assumptions through update_lib, preserving the existing DocTestChecker adaptation. Align paired dict/set comment corrections without claiming new coverage.
Assisted-by: OpenAI Codex: model version unavailable
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Co-authored-by: Codex <codex@openai.com>
- Rewrite faulthandler with live frame walking via
Frame.previous AtomicPtr chain and thread-local
CURRENT_FRAME (AtomicPtr) instead of frame snapshots
- Add signal-safe traceback dumping (dump_live_frames,
dump_frame_from_raw) walking the Frame.previous chain
- Add safe_truncate/dump_ascii for UTF-8 safe string
truncation in signal handlers
- Refactor write_thread_id to accept thread_id parameter
- Add SA_RESTART for user signal registration, SA_NODEFER
only when chaining
- Save/restore errno in faulthandler_user_signal
- Add signal re-entrancy guard in trigger_signals to
prevent recursive handler invocation
- Add thread frame tracking (push/pop/cleanup/reinit)
with force_unlock fallback for post-fork recovery
- Remove expectedFailure markers for now-passing tests
