fix(testing): add ignored-test audit script + weekly cron + policy (#839)

[zackees]

Summary

Adds visibility for #[ignore]-gated tests across the workspace:

• ci/audit_ignored_tests.py — stdlib-only Python script that walks the workspace, parses every #[ignore] / #[ignore = \"...\"] attribute, and emits either CSV (default) or markdown. Example CSV row:

  crates/fbuild-deploy/src/esp32/tests.rs,try_verify_deployment_real_esp32,requires real ESP32 board — set ESP32_PORT and ESP32_FIRMWARE,714
  

• .github/workflows/audit-ignored-tests.yml — weekly cron (0 0 * * MON) + workflow_dispatch. Runs the script with --markdown and rewrites the body of tracking issue tracking: ignored-test inventory (driven by #839) #880 via gh issue edit. Permissions: issues: write.
• CLAUDE.md — new "Ignored-test policy (process: ignored-test policy + bitrot audit (#826 followup) #839)" section (placed after the existing TDD block). Every #[ignore] MUST have a reason string referencing either a tracking issue (#NNN) or a hardware/toolchain requirement.

First-seen-date tracking is intentionally deferred to a follow-up — this PR ships current-state inventory.

Inventory at time of PR

Run against main: 39 findings, of which 20 lack a reason string (policy violations under the new policy).

Test plan

• uv run --no-project python ci/audit_ignored_tests.py --csv | head produces a well-formed CSV with header file,test_name,reason,line.
• uv run --no-project python ci/audit_ignored_tests.py --markdown produces a GitHub-flavored table with summary counts.
• Regex correctly handles #[ignore] followed by an inline // comment (e.g. crash_decoder.rs:743).
• Skip list excludes vendored sources (.cargo/, target/).
• Cron will fire and update issue tracking: ignored-test inventory (driven by #839) #880 on the first Monday after merge; manual gh workflow run audit-ignored-tests.yml available for early validation.

Tracking issue: #880

Closes #839

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: b1f3aebc-99c0-4302-abe9-09f4de994199

📥 Commits

Reviewing files that changed from the base of the PR and between d17655c and bb35a51.

📒 Files selected for processing (3)

• .github/workflows/audit-ignored-tests.yml
• CLAUDE.md
• ci/audit_ignored_tests.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/839-ignored-test-audit-script-cron-policy

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