Fix: enrich A5 scheduler stall diagnostics

[vegetabledoww]

Summary

• Guard resolve_and_dispatch() against an uninitialized scheduler state.
• Include hardware, running, and pending task tokens in A5 FIN anomaly logs to make scheduler token drift diagnosable.

Relation

Related to #1582.

[coderabbitai]

📝 Walkthrough

Walkthrough

The scheduler anomaly output now includes hardware and software task tokens. resolve_and_dispatch now asserts that the scheduler pointer is initialized before accessing scheduler state.

Changes

Scheduler runtime safeguards

Layer / File(s)	Summary
Anomaly status diagnostics src/a5/runtime/tensormap_and_ringbuffer/runtime/scheduler/scheduler_cold_path.cpp	Anomaly status output now includes cond_tok, running_tok, and pending_tok.
Dispatch initialization guard src/a5/runtime/tensormap_and_ringbuffer/runtime/scheduler/scheduler_dispatch.cpp	resolve_and_dispatch now asserts that the scheduler pointer is non-null before continuing.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• hw-native-sys/simpler#1176: Modifies the same scheduler paths with different orchestration and synchronization changes.
• hw-native-sys/simpler#1435: Overlaps the same scheduler diagnostics and dispatch paths.
• hw-native-sys/simpler#1437: Modifies the same scheduler diagnostics and resolve_and_dispatch function.

Poem

A rabbit checks the scheduler gate,
While tokens make anomaly status complete.
Hardware and tasks now leave a trace,
Null pointers stop before the race.
Hop, hop—dispatch runs with clearer state!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the primary change to improve A5 scheduler stall diagnostics.
Description check	✅ Passed	The description accurately covers both scheduler-state safeguards and enhanced A5 anomaly diagnostics.

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