- Strip leading / from pattern before git check-ignore so root-anchored
patterns like /AGENTS.md are checked as repo-relative paths (AGENTS.md)
and correctly match existing rules — fixes duplicates on every run
- Rework helper to accept multiple patterns and write them as a single
labeled block with project-style header/footer comment rather than
appending bare patterns one at a time
- Move gitignore calls out of per-plug loop in --plugins mode so all
three docs/ patterns are checked and written in one block
- Remove 5 duplicate bare entries left in .gitignore by the broken runs
rootiest
