feat: add commit-docs-reminder hook to enforce checklist before commits

Adds a PreToolUse Bash hook that reminds AI agents to verify
status-update-checklist.md before running git commit. Also adds
the corresponding constraint to RULES.md section 3.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/hooks/commit-docs-reminder.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+# Remind Claude to check status-update-checklist before committing
+# Event: PreToolUse | Matcher: Bash
+# Exit 0 = allow (non-blocking reminder)
+
+INPUT=$(cat)
+COMMAND=$(echo "$INPUT" | jq -r '.tool_input.command // empty')
+
+if [ -z "$COMMAND" ]; then
+  exit 0
+fi
+
+# Only trigger on git commit commands (not git add, git status, etc.)
+if echo "$COMMAND" | grep -qE 'git\s+commit'; then
+  echo "REMINDER: Before committing, verify that .claude/status-update-checklist.md was followed." >&2
+  echo "If this commit changes project status, audit findings, or phase progress," >&2
+  echo "you MUST synchronize: RULES.md, RECOMMENDATIONS.md, README.md, DOCS.md." >&2
+  echo "If this is a code-only change with no status impact, proceed." >&2
+fi
+
+exit 0