docs: AGENTS.md GCC-15 gotcha — the array-bounds fix is backported now

[jamesarich]

The -Werror=array-bounds gotcha still described GCC 15 as known-broken; #26 backported the scoped pragma that fixes it. Not re-verified with GCC 15 here (nix shell has 13.3), and the note says so.

Summary by CodeRabbit

• Documentation
  • Updated ARM GCC toolchain guidance.
  • Clarified the CI toolchain version and documented GCC 13.3.Rel1 as a verified fallback.
  • Revised notes on GCC 15 compatibility and removed an outdated failure claim.

[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: 0ddafcfa-7f64-4dae-b184-f7c6728167ee

📥 Commits

Reviewing files that changed from the base of the PR and between 61c9ebe and 166d696.

📒 Files selected for processing (1)

• AGENTS.md

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The ARM GCC compatibility note now documents the CI version, the verified fallback version, and the current status of the GCC 15 diagnostic fix.

Changes

ARM GCC compatibility guidance

Layer / File(s)	Summary
Revise compiler compatibility note AGENTS.md	The note keeps CI pinned to GCC 12.3.Rel1, identifies GCC 13.3.Rel1 as a verified fallback, and records that GCC 15 previously failed with array-bounds while the fix is present but unverified in a rebuilt GCC 15 environment.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Merge Risk: ⚪ Minimal · up to 166d6

This updates AGENTS.md to reflect the backported GCC 15 array-bounds fix; no actionable merge-blocking risk remains after normal checks and review.

Poem

A rabbit checks the compiler trail,
GCC versions line the rail.
Twelve runs CI, thirteen can stand,
Fifteen waits for a fresh build planned.
The bounds fix rests in code tonight.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the documentation change and the backported GCC 15 array-bounds fix.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
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.

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