feat(seats): an API seat's cycle starts on its own grant day

The ledger reset every API seat's spend on one
REVIEW_GATES_API_CYCLE_DAY and cleared every credit-out, an OpenRouter
key's too, at that reset. Each API seat's cycle starts on its
ANTHROPIC_API_KEY<n>_GRANT_DAY now (1..31, a day past a month's end its
last), else the cycle day, also 1..31. A credit-out carries across the
rollover, and the run's probe tries a key held out on credit again, as
`seats` does an API key: an ok lifts the mark - an API key's is new
credits, its cycle restarting from the grant day, or from today when
that day is over a week back; an OpenRouter key keeps its cycle's spend,
and a key that answers with its cycle's budget spent stays out on that
budget. A probe that finds a key out of credit records it, unless the
ledger already has it out. Both are decided in one locked update on the
file's entry, a mark another driver made since the probe started
standing, and the ledger's stamps carry their UTC offset so marks are
ordered by instant.

`seats` shows the probe's reading beside the driver's verdict (the
`probe` and `driver` columns replace `state` and `ledger: out`), each
seat's grant day and when its next credits are due, and notes on what
the probe changed in the ledger or why the driver's verdict stands; the
run logs the days.

packaging/flatpak/net.catcrafts.CrafterReview.metainfo.xml

@@ -31,8 +31,13 @@
       <description>
         <p>New</p>
         <ul>
+          <li>Each API seat's credit cycle starts on its own grant day, <code>ANTHROPIC_API_KEY&lt;n&gt;_GRANT_DAY</code> in the seats file. A seat out of credit stays out across the rollover until a probe sees its key answer again, and <code>seats</code> shows each API seat's grant day, when its next credits are due and whether the driver holds it out.</li>
           <li>Leaving <code>authors</code> out of the config turns the freeze's author and committer check off, where it used to check <code>git config user.email</code>. An empty list is a config error.</li>
         </ul>
+        <p>Fixes</p>
+        <ul>
+          <li>An OpenRouter key that ran out of credit is probed again at every run instead of waiting for the month's turn.</li>
+        </ul>
       </description>
     </release>
     <release version="1.0.1" date="2026-11-02">