Closes M2's known blind spot. On the first pass of a new boot, every RUNNING
timer has its monotonic anchor rewritten from its wall-clock fallback — one
already past its end becomes EXPIRED, one with no fallback becomes PAUSED at
its banked remaining. The stopwatch keeps no wall-clock fallback at all, so it
is paused at what it had banked rather than being allowed to invent a segment
it never ran.
The gate is persisted, so the repair runs once per boot and survives a process
death in between. ARCHITECTURE §5 booked the stopwatch half of this to M7; it
belongs here with the timer half, and the roadmap is amended to say so.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>