The enforce loop now waits on an inotify watch of log.json's directory
(_file_wake, ctypes, no new dependency) instead of a plain sleep, so a
credited workout moves the gaming budget within the tick. Earner answers
(workout, LeetCode, reading) are memoised with the source file's
(inode, mtime_ns, size) stamp, so a rewritten file re-asks at once instead
of after the 60 s TTL. Any inotify setup or read failure warns and falls
back to the plain sleep; the stamp still catches the change next tick.
Tests: conftest stubs the wake factory and points workout_log_path at a
tmp path, so no test ever watches the real screen-locker tree.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018RHwVPyiiQMPh4M3JQwQku
