Add PreToolUse hook to block AI writing check

.claude/hooks/enforce-makefile.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -euo pipefail
+
+# PreToolUse hook: intercept commands that should use Makefile targets instead.
+# Exit 0 with JSON deny = block the command and suggest an alternative.
+# Exit 0 with no output = allow the command.
+
+INPUT=$(cat)
+COMMAND=$(printf '%s' "$INPUT" | jq -r '.tool_input.command // empty')
+
+# Block direct invocation of the AI writing check script
+# Match only actual script execution (uv run python / python), not mentions in strings
+if [[ "$COMMAND" =~ (uv\ run\ python|python3?|\./).*check_ai_writing\.py ]]; then
+  jq -n '{
+    hookSpecificOutput: {
+      hookEventName: "PreToolUse",
+      permissionDecision: "deny",
+      permissionDecisionReason: "Do not run the AI writing check script directly. Instead, avoid using em dashes (U+2014) in any code or text you write. The check runs automatically via pre-commit hooks."
+    }
+  }'
+  exit 0
+fi
+
+# Allow everything else
+exit 0

.claude/settings.json

@@ -0,0 +1,16 @@
+{
+  "hooks": {
+    "PreToolUse": [
+      {
+        "matcher": "Bash",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "bash \"$CLAUDE_PROJECT_DIR/.claude/hooks/enforce-makefile.sh\"",
+            "timeout": 5
+          }
+        ]
+      }
+    ]
+  }
+}