v0.4.6 — a real break burns the debt

Come back to your machine after an hour away and the counter no longer greets you with a debt you already walked off.

The 45-minute reset was only wired into the prompt hook, so it needed you to type something. Return to a window where the agent kept working on its own and only PostToolUse runs — nothing reset, and that first check refreshed the activity mark, so by the time you did type, no gap was visible any more. The rule couldn't fire in exactly the case it was written for.

The break is now measured on the OS input clock: while you're away each check records when you last touched the machine, and the first check after your return compares that against your first touch back. A 45+ minute gap zeroes the debt right there, before any nudge is considered.

Nothing else changes: short breaks still keep your debt, present-human accounting is untouched, and systems without an idle clock (Linux) behave exactly as before.