Tests cover all security utilities introduced in the previous commit: - validatePathWithinRoot: path traversal prevention (7 tests) - safeJsonParse: corrupted JSON fallback handling (6 tests) - clamp: input range clamping (5 tests) - FileLock: cross-process file locking (7 tests) - Atomic config writes: temp file + rename pattern (3 tests) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>