v0.8.0 — name the wall

Claude Code can now offer /low-priority at a spent 5h session window, but
the gated offer, active mode, and separate allowance do not exist in
/api/oauth/usage. ccpace now says what its source can prove:
5h capped · 47% of 7d left · back @Tue 2 04:00. It distinguishes the
shorter wall from the weekly pool without claiming a session-only escape is
available for an account it cannot see into.

Notifications now carry the same facts. Their producers and formatter had
drifted onto different key names, causing real threshold and delta messages
to say 0%; the payload now has canonical window, utilization,
reset_at, and reset_time fields while retaining the old aliases for
custom hooks. Custom-notifier envelopes also gain a stable event id, such
as full:work:5h:<reset>, for dedupe and tracing across restarts.

The old watch cache used the maximum of every counter as an account-level
stop: 5h at 100, or one scoped model at 100, froze the whole account until a
reset. That is false once lower-priority service can bypass 5h, and it was
already false for another model. Worse, the early return ignored a newer
shared cache from statusline and even r. The cache is now reserved for
one genuinely terminal state — aggregate 7d spent with no paid path — and
both newer shared evidence and manual refresh evict it.

85 tests.