- core.py: rename RATE_LIMIT_WINDOW → RATE_LIMIT_WINDOW_SECONDS (env var name RATE_LIMIT_WINDOW is unchanged — only the Python attribute) - core.py: extract _BUSY_TIMEOUT_MS = 5000 local constant so the PRAGMA value is no longer a bare magic number - worker.py: rename poll_interval → poll_interval_seconds Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>