v0.7.9.7 — a device that said it was available all day after it was gone

The last item off 0.7.9.6's sweep, parked there as the one genuine maybe.
It had a second half worth more than the first.

#101 — Telegraph (+4), Telephone (+8) and Radio (+12) are "once a day,
when dispatching facing trains, add +N to the other train's number".
`enhancementText(key)` takes only the KEY, so the tooltip could not vary
with anything: a spent Radio read "Once a day, add +12..." for the rest
of the Day, advertising a bonus that was not there. That is `trainRules`
before #100, in another corner of the same view.

THE HALF THAT ACTUALLY SURPRISES. `spendDispatchBonus` reads
`areaOf(s, s.clock.superintendent)` — the SUPERINTENDENT's own devices,
not the train owner's — and the Fedora moves every STAGES_PER_SHIFT (3)
Stages, four times a Day. So a player's Radio does nothing at all for
three-quarters of the Day, and is spent automatically, without its owner
being asked, during the quarter it is theirs. Neither half was anywhere
on the board.

The card now reads as one of three states — available and dispatching,
unspent but idle while somebody else holds the Fedora, or spent until the
next Day — and names the shift length, because "not now" without "for how
long" is half an answer. A spent device is struck through on the board.
Shown on EVERY district, not only the viewer's (Jesse's call): it is
public, and a rival's spent Radio is what you want to know before forcing
a meet.

What counts as a device is `enhancementRule(key)?.dispatchBonus` rather
than three keys written out in the view — the ladder lives in
ENHANCEMENT_RULES and a fourth rung would otherwise be silently exempt.

A STALE COMMENT CORRECTED, AND PINNED. `advance.ts` warned that indexing
a SEAT-keyed area with the PLAYER holding the Fedora "is right only while
seating is the identity map". It read as a live Employee Rotation bug and
was not one: `areaOf(s, p)` IS `areaAtSeat(s, seatOf(s, p))`. A comment
that sends the next reader chasing a bug that does not exist costs about
what the bug would. Rewritten, and the claim is now a test — seating set
to a real permutation, and the Superintendent's own district rather than
the seat with the same index is the one that reads as dispatching.

TWO THINGS MUTATION CAUGHT THAT PASSING DID NOT. A test asserted the
ABSENCE of /spent|Fedora/ with the Fedora held, and a mutant with the
`dispatchBonus` guard deleted PASSED it — the leaked text in that case
says "Available today, and this district is dispatching", which contains
neither word. A test that something was left alone has to compare it
against what it should be, so it asserts equality with `enhancementText`
now, in both Fedora states. And the replay wire format needed the field:
cells pack positionally, so the flag is index 9 and reads `?? []`, the
same tolerance `standingWest` uses — older recordings report no device
spent, which is what they drew at the time, so every published replay is
unchanged.

943 tests pass, up from 934.

NOT VERIFIED AT A TABLE, like 0.7.9.6. #39 and #35 still stand.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y5boPxP6JHRYMm8adXaF5R

src/engine/advance.ts

@@ -688,8 +688,16 @@ function spendDispatchBonus(
   const mine = tray.trainNumber ?? 99;
   const theirs = other.trainNumber ?? 99;
 
-  // The Fedora is held by a PLAYER, and the dispatch devices are installed in an Office Area, which
-  // is keyed by SEAT. Indexing one with the other is right only while seating is the identity map.
+  /**
+   * The Fedora is held by a PLAYER; the devices are installed in an Office Area, which is keyed by
+   * SEAT. `areaOf` is what reconciles the two — it resolves through `seatOf` — so this is correct
+   * under Employee Rotation and not only while seating happens to be the identity map.
+   *
+   * This comment used to say the opposite, warning that indexing one with the other was safe only
+   * while seating was identity. It read as a live bug and was not one: `areaOf(s, player)` IS
+   * `areaAtSeat(s, seatOf(s, player))`. Pinned by test rather than asserted here — see #101's
+   * "spends the Superintendent's own devices under non-identity seating".
+   */
   const area = areaOf(s, s.clock.superintendent);
 
   // Best device first — Radio (+12) beats Telephone (+8) beats Telegraph (+4).