ownerdiff: CODEOWNERS for a git range

Monorepo PRs (and agent sessions) touch many teams. ** ownerdiff** maps changed paths onto

CODEOWNERS

and groups by owner. No network. No LLM.

go install github.com/SybilGambleyyu/ownerdiff/cmd/ownerdiff@v0.3.0
ownerdiff origin/main...HEAD
ownerdiff -format markdown main..HEAD
ownerdiff HEAD~5 -owner @platform      # one team's slice
ownerdiff HEAD~5 -only-unowned         # CODEOWNERS gaps
ownerdiff HEAD~5 -fail-unowned         # CI: exit 2 if unowned

v0.3 adds -owner

and -only-unowned

filters so a platform team can review only their paths, or an audit can list unowned files without the rest of the noise.

One-shot install with the rest of the kit:

curl -fsSL https://raw.githubusercontent.com/SybilGambleyyu/review-kit/main/install.sh | bash
gitdigest origin/main...HEAD -summary
ownerdiff origin/main...HEAD
lockglance -git origin/main...HEAD -summary