feat(pi): implement milestone M3 - workflow skills

scripts/verify-pi-workflows.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+WORKFLOW_FILES=(
+  "skills/create-plan/pi/SKILL.md"
+  "skills/do-task/pi/SKILL.md"
+  "skills/implement-plan/pi/SKILL.md"
+)
+
+# These terms cover the Codex-only constructs explicitly called out by the plan.
+# Expand this deny-list if later pi workflow ports introduce new harness-specific tokens.
+
+for file in "${WORKFLOW_FILES[@]}"; do
+  test -f "$file"
+  grep -q 'docs/PI-SUPERPOWERS.md' "$file"
+done
+
+test -f skills/create-plan/pi/templates/continuation-runbook.md
+test -f skills/create-plan/pi/templates/milestone-plan.md
+test -f skills/create-plan/pi/templates/story-tracker.md
+test -f skills/do-task/pi/templates/task-plan.md
+test -x skills/reviewer-runtime/pi/run-review.sh
+test -x skills/reviewer-runtime/pi/notify-telegram.sh
+
+! rg -n 'update_plan|plan mode|sub-agent|subagents' "${WORKFLOW_FILES[@]}"
+
+echo "pi workflow skill docs verified"