CI: document PR title convention for CI-only PRs

[jnasbyupgrade]

Summary

• CI-only PRs get a CI: title prefix — recorded in CLAUDE.md so it's a standing convention.
• Updated: the boundary isn't "diff confined to .github/workflows/" — it's whether the diff touches the actual code at all (hard boundary, err toward NOT CI-only when unsure). Files elsewhere that don't touch the code (.gitignore, this file) qualify too; test/ is treated as NOT CI-only by default despite being a bit of a grey area.
• Applied the prefix to this PR itself under the corrected rule (touches only CLAUDE.md), plus CI: bump GitHub Actions to latest versions #13 and CI: bump Actions pins, add track_progress, add claude-debug label toggle #15.

🤖 Generated with Claude Code

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