feat(flutter-cursor-templates): introduce MCP integration and conventions in project brief

- Added optional MCP integration settings in project-brief.yaml, allowing for environment-based server configurations.
- Introduced conventions for strict package imports to enhance code organization and maintainability.
- Updated brief schema to validate new MCP properties and ensure correct usage.
- Implemented MCP JSON builder to generate .cursor/mcp.json based on project brief settings.
- Enhanced resolver to include MCP configuration in generated files when enabled.

This update improves integration capabilities and enforces coding standards across the project.

flutter-cursor-templates/tool/cursor_audit.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+# Cursor rule hygiene — run from the Flutter app repository root.
+# Usage: bash tool/cursor_audit.sh
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+RULES_DIR="$REPO_ROOT/.cursor/rules"
+
+if [[ ! -d "$RULES_DIR" ]]; then
+  echo "No .cursor/rules at $RULES_DIR — run cursor_gen first."
+  exit 0
+fi
+
+echo "=== Cursor rule audit ==="
+echo "Rules without fenced code blocks (\`\`\`):"
+missing=0
+while IFS= read -r -d '' f; do
+  if ! grep -q '```' "$f" 2>/dev/null; then
+    echo "  $f"
+    missing=1
+  fi
+done < <(find "$RULES_DIR" -name '*.mdc' -print0)
+
+if [[ "$missing" -eq 0 ]]; then
+  echo "  (none — every .mdc contains at least one \`\`\` fence)"
+fi
+
+echo ""
+echo "Rules with alwaysApply: true (should be few):"
+grep -rl 'alwaysApply: true' "$RULES_DIR" 2>/dev/null | while read -r p; do echo "  $p"; done || true
+
+echo ""
+feat_dir="$RULES_DIR/features"
+if [[ -d "$feat_dir" ]]; then
+  echo "Stale feature rules (no lib/features/<name>):"
+  stale=0
+  for f in "$feat_dir"/*.mdc; do
+    [[ -e "$f" ]] || continue
+    name="$(basename "$f" .mdc)"
+    if [[ ! -d "$REPO_ROOT/lib/features/$name" ]]; then
+      echo "  STALE: $f"
+      stale=1
+    fi
+  done
+  if [[ "$stale" -eq 0 ]]; then
+    echo "  (none)"
+  fi
+else
+  echo "No rules/features/ directory."
+fi
+
+echo "=== Done ==="