✨ feat(workflow): adopt Matt Pocock ticket workflow

Replace the Superpowers plan pipeline with grill-with-docs, specs, local tickets, and ticket-native execution.

BREAKING CHANGE: Remove the legacy Plan CLI, prompt templates, and Superpowers skills.

skills/thirdparty/git-guardrails-claude-code/scripts/block-dangerous-git.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+INPUT=$(cat)
+COMMAND=$(echo "$INPUT" | jq -r '.tool_input.command')
+
+DANGEROUS_PATTERNS=(
+  "git push"
+  "git reset --hard"
+  "git clean -fd"
+  "git clean -f"
+  "git branch -D"
+  "git checkout \."
+  "git restore \."
+  "push --force"
+  "reset --hard"
+)
+
+for pattern in "${DANGEROUS_PATTERNS[@]}"; do
+  if echo "$COMMAND" | grep -qE "$pattern"; then
+    echo "BLOCKED: '$COMMAND' matches dangerous pattern '$pattern'. The user has prevented you from doing this." >&2
+    exit 2
+  fi
+done
+
+exit 0