docs: extend commit rules to cover tooling-path enumeration

The no-attribution rules covered AI credit but not incidental mentions of tooling filenames in commit prose. The case that bit: a .gitignore commit naming .claude, CLAUDE.md, and .ai in its message leaks the tooling layer into a public log. Adds a tooling-path-enumeration ban with that gitignore case named, extends the Before-Committing scan, and adds the missing paths to the protocols keep-out list. Both carry the file-is-the-change and private-single-user-repo exemptions, so a rule edit or a rulesets commit can still name what it touched.

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