feat: Add linting script for coder_agent naming conventions

Add a simple bash script that validates module documentation uses
coder_agent.main consistently. This can be integrated into CI to
prevent future inconsistencies.

The script checks:
- Module README files use coder_agent.main
- Example templates use coder_agent.main
- Root documentation uses coder_agent.main

Usage: ./scripts/lint-agent-names.sh

scripts/lint-agent-names.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Script to validate coder_agent naming conventions across the registry
+# This ensures consistency between templates and module documentation
+
+ERRORS=0
+
+echo "🔍 Linting coder_agent naming conventions..."
+echo ""
+
+# Check 1: Module README files should use coder_agent.main
+echo "📝 Checking module README files..."
+if grep -r 'coder_agent\.' registry/*/modules/*/README.md 2> /dev/null | grep -v 'coder_agent\.main' | grep -v 'agent_id' | grep -v 'coder_agent\.id' | grep -v '# ' | grep -E 'coder_agent\.[a-z_]+'; then
+  echo "❌ ERROR: Module READMEs should reference 'coder_agent.main' in examples"
+  echo "   Found references to other agent names above."
+  ERRORS=$((ERRORS + 1))
+else
+  echo "✅ All module READMEs use 'coder_agent.main'"
+fi
+echo ""
+
+# Check 2: Examples should use coder_agent.main
+echo "📝 Checking example files..."
+if [ -f "examples/templates/main.tf" ]; then
+  if grep -q 'coder_agent\.' examples/templates/main.tf | grep -v 'coder_agent\.main' 2> /dev/null; then
+    echo "❌ ERROR: examples/templates/main.tf should use 'coder_agent.main'"
+    ERRORS=$((ERRORS + 1))
+  else
+    echo "✅ Example template uses 'coder_agent.main'"
+  fi
+fi
+echo ""
+
+# Check 3: Root documentation should use coder_agent.main
+echo "📝 Checking root documentation..."
+FILES_TO_CHECK=("README.md" "CONTRIBUTING.md")
+for file in "${FILES_TO_CHECK[@]}"; do
+  if [ -f "$file" ]; then
+    if grep 'coder_agent\.' "$file" 2> /dev/null | grep -v 'coder_agent\.main' | grep -v '# ' | grep -v 'agent_id' | grep -v 'coder_agent\.id' | grep -E 'coder_agent\.[a-z_]+' > /dev/null 2>&1; then
+      echo "❌ ERROR: $file should use 'coder_agent.main' in examples"
+      ERRORS=$((ERRORS + 1))
+    fi
+  fi
+done
+
+if [ $ERRORS -eq 0 ]; then
+  echo "✅ All documentation uses 'coder_agent.main'"
+fi
+echo ""
+
+# Summary
+if [ $ERRORS -eq 0 ]; then
+  echo "✅ All linting checks passed!"
+  exit 0
+else
+  echo "❌ Found $ERRORS linting error(s)"
+  echo ""
+  echo "ℹ️  Module documentation should use 'coder_agent.main' in examples"
+  echo "   to match the most common template convention (78% of templates)."
+  exit 1
+fi