Update: classify TMR platform differences

[yanghaoran29]

Summary

• Pin the A2/A3-to-A5 TMR comparison to current mainline commit 317a19c2ee04bcc3e36d1cb49d2037084455a3ad.
• Classify the complete comparison boundary into byte-identical, compile-time or non-functional, and functional differences.
• Document all 53 matching paths and the two A5-only URMA backend paths without treating mechanical differences as runtime behavior.

Testing

• pre-commit run --files docs/tensormap-and-ringbuffer-a2a3-vs-a5.md
• git diff --check
• Exhaustive file-set check: 53 classified matching paths, with no missing or extra entries

Docs-only change; runtime tests were not required.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 045d8c87-17af-4bc0-8fcf-94ec438b5ec6

📥 Commits

Reviewing files that changed from the base of the PR and between ab9bdb9 and 43612ac.

📒 Files selected for processing (1)

• docs/tensormap-and-ringbuffer-a2a3-vs-a5.md

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📝 Walkthrough

Walkthrough

The documentation replaces a PR-based maintenance baseline with commit ab9bdb93c50b95032e314adf93f66f12476b10c5. It also adds runtime/pto_async_kernel_api.h to the byte-identical runtime file list.

Changes

Documentation baseline

Layer / File(s)	Summary
Update maintenance baseline and runtime file list docs/tensormap-and-ringbuffer-a2a3-vs-a5.md	The document now references commit ab9bdb93c50b95032e314adf93f66f12476b10c5 and includes runtime/pto_async_kernel_api.h in the byte-identical runtime file list.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Mergeability Score: ⚪ Minimal · up to 43612

This documentation-only change is merge-ready after normal checks and review; no actionable merge-blocking risk remains.

Possibly related PRs

• hw-native-sys/simpler#1718: Modified runtime/pto_async_kernel_api.h in the A2/A3 and A5 implementations.
• hw-native-sys/simpler#1774: Introduced and populated the architecture document.
• hw-native-sys/simpler#1795: Supplied the previous documentation maintenance baseline.

Poem

A rabbit updates the baseline with care,
And adds one runtime header there.
The byte lists now match the plan,
Commit records show where they began.
Hop, hop—documentation is clear!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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 accurately identifies the documentation update that classifies TMR platform differences.
Description check	✅ Passed	The description directly explains the baseline update, comparison classifications, documented paths, and validation steps.

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