Add 5 pi extensions: pi-subagents, pi-crew, rpiv-pi, pi-interactive-shell, pi-intercom

extensions/pi-crew/skills/git-master/SKILL.md

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+---
+name: git-master
+description: Commit and release hygiene for safe version-control work. Use when preparing commits, releases, version bumps, publishing, or validating package installation.
+---
+
+# git-master
+
+Use this skill for commit/release hygiene.
+
+## Commit rules
+
+- Check `git status --short` before staging.
+- Stage only files related to the current task.
+- Keep commits independently revertible.
+- Use concise imperative commit messages.
+- Do not push or publish unless explicitly requested.
+- Do not include secrets, OTPs, local temp files, or generated tarballs.
+
+## Release rules
+
+- Run the required verification gate before version bumps.
+- Bump version only after tests pass and user confirms publish intent.
+- Verify registry after publish with `npm view`.
+- Install through `pi install npm:pi-crew` when validating Pi package loading.