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

extensions/pi-crew/skills/worktree-isolation/SKILL.md

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+---
+name: worktree-isolation
+description: Conflict-safe git worktree workflow. Use when running parallel implementation workers, isolating risky edits, or cleaning up task worktrees.
+---
+
+# worktree-isolation
+
+Use this skill for worktree-based execution or cleanup.
+
+## Source patterns distilled
+
+- pi-subagents worktree runner and cleanup patterns
+- pi-crew worktrees: `src/worktree/worktree-manager.ts`, `src/worktree/cleanup.ts`, `src/worktree/branch-freshness.ts`
+- Team runner workspace mode: `src/runtime/team-runner.ts`, workflow/team resource fields
+
+## Rules
+
+- Use worktree mode for parallel or risky code-changing tasks when the repository is clean enough and merge ownership is clear.
+- Assign one owner per file/symbol/migration path to avoid conflict-heavy merges.
+- Name branches/worktrees deterministically from run/task IDs; avoid user-controlled path fragments without sanitization.
+- Before cleanup, check dirty state. Preserve dirty worktrees unless `force` is explicitly set.
+- Record worktree paths and branch metadata in artifacts/events so the operator can inspect or recover.
+- Do not run destructive git operations without explicit confirmation and evidence of target path containment.
+
+## Anti-patterns
+
+- Parallel editing the same file in multiple worktrees without a merge plan.
+- Force-removing dirty worktrees by default.
+- Reusing stale worktrees after the base branch has moved without freshness checks.
+- Storing worktrees outside the intended contained workspace root.
+
+## Verification
+
+```bash
+cd pi-crew
+npx tsc --noEmit
+node --experimental-strip-types --test test/integration/worktree-mode.test.ts test/unit/run-index.test.ts
+npm test
+```