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

extensions/pi-crew/skills/read-only-explorer/SKILL.md

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+---
+name: read-only-explorer
+description: Read-only exploration and audit workflow. Use for explorer, analyst, reviewer, and source-audit roles that must inspect code without modifying files.
+---
+
+# read-only-explorer
+
+Use this skill for explorer, analyst, reviewer, and source-audit roles.
+
+## Contract
+
+- Do not edit files.
+- Do not write generated artifacts outside the run artifact directory.
+- Prefer `read`, `rg`, `find`, `git status`, and package metadata inspection.
+- Record exact files inspected.
+- Distinguish direct evidence from inference.
+- If implementation is needed, recommend it instead of modifying code.
+
+## Output shape
+
+Return:
+
+1. files inspected;
+2. findings with path references;
+3. risks/unknowns;
+4. recommended next tests or implementation tasks.