v0.7.9.6 — three things the engine knew and the screen did not

Found by looking rather than by being told. Gitea#21, #22, #94 and #96
were four instances of one fault in a row — the engine gains something
that changes what a train may do, and nothing draws it — and every one
was found by a player hitting it. So instead of waiting for the fifth,
every field of GameState and its nested types was enumerated, checked for
a reader in sim/view.ts, src/web/ and sim/narrate.ts, and the survivors
verified BY RUNNING THE ENGINE rather than by trusting the grep.

Four fields had no reader. `movedThisPhase` lives and dies inside one
`advance` call and is nobody's business. The other three are below. What
was ruled out matters as much: `freightWorked`, `drawnThisTurn`,
`freightAgentUsed`, `switchedSince` and `movesUsed` are invisible on
purpose, their effect already showing as legality or as a complement
already on the Frame. A field is not a display gap merely because nothing
renders it.

#98 — the Crew Tray pool. §7 scarcity is called an explicit mechanic and
was explicit only in the engine. The blocked panel had one tray rule,
keyed off the train due out this Stage, so a player who spent a card on
an Extra or ordered a second section got an EMPTY panel while their train
sat behind an exhausted pool — both having been announced once in the log
in a line promising a future event that nothing then confirmed. The
shared table carries the pool and the queue now, so the common board gets
it too, and the panel reports all three with the count beside them.

#99 — a train held at the Limits vanished off the board, and this one had
shipped. The Interlocking stops an inbound train on the Limit Track
rather than colliding with a full Office. `arriveAtOffice` removes the
tray from the Mainline node's `transits` and the Interlocking branch
pushes it onto `heldAtLimits` without assigning `tray.position` — and the
map draws mainline nodes from `transits` and squares from
`position.at === 'grid'`, so between the two it was drawn in NEITHER. It
disappeared on arrival and reappeared in the Office some Stages later.
Fixed in the view: the engine is right, and `position` is left alone
deliberately so nothing treats the train as standing somewhere it could
be switched from.

#100 — the Campaign Train's speeches change its rules, and the card said
the same thing before and after. Worse, the "EXPEDITED ... costs 1
Revenue" warning prints only under `rules.expedite`, so X17 became
subject to a fault whose warning the game shows to every other expedited
train and never to it. `trainRules` reads `speechMade` now and borrows
`isExpedited` from advance.ts rather than restating the test.

#45 — the 0.7.9 dead-field audit, finished, and the answer was different
for each. `overHandLimit` is WIRED: its consumer existed all along and
was inferring the hand limit from the ABSENCE of `draw.end` in the menu,
which is sound only while `check` keeps refusing for exactly three
reasons. `viewerSeat` is DOCUMENTED, with a condition — Gitea#20's board
keys districts by seat, and the note says to delete it if step 2 ships
without using it.

The audit had missed a third limb. `game.mustPlayCard` was assigned on
every submit and read by nothing: deleted. Chasing it turned up the thing
worth fixing — the §6.2 hand-limit test existed in THREE places, all
agreeing, which is the state #96's disagreement started from. One
`overHandLimit(state, player)` in state.ts now, and the other two ask it.
`Session.overHandLimit()` is deleted rather than kept: the Frame already
carries the fact, so the method was a second path to it.

934 tests pass, up from 917. The 17 new ones were written red, and each
fix checked by mutation: reverting `speechMade` fails 2, dropping the
held-train projection fails 4, forgetting the tray queues fails 2. The
empty blocked panel is reported beside its positive control, since an
empty result from a broken function proves nothing.

NOT VERIFIED AT A TABLE. Engine and view work, checked by tests and by
running the engine. #39 and #35 still stand.

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

src/web/session.ts

@@ -29,7 +29,6 @@ import {
   handPlayable,
   isOutOfTurn,
   newGame,
-  overHandLimit,
   submit,
   toSave,
   undo,
@@ -58,8 +57,6 @@ export type Session = {
   seat(): PlayerIndex;
   /** Whose turn it is, or null when the game is over or waiting on nothing. */
   actor(): PlayerIndex | null;
-  /** True when the hand is over §6.2's limit and the turn cannot be ended. */
-  overHandLimit(): boolean;
   /** Which cards in hand are playable right now, in hand order. */
   handPlayable(): boolean[];
   /**
@@ -161,7 +158,6 @@ export function createLocalSession(seed: number, options?: NewGameOptions): Loca
     menu: () => actionMenu(game),
     seat: () => 0,
     actor: () => currentActor(game),
-    overHandLimit: () => overHandLimit(game),
     handPlayable: () => handPlayable(game),
     submit: async (intent: Intent) => {
       // Seat 0 is the solitaire player, and the extension vote (Gitea#11) is the one intent that
@@ -341,7 +337,6 @@ export function createRemoteSession(
     menu: () => menu ?? { options: [], direct: [], placeable: [], hand: [], makeUp: null },
     seat: () => seat,
     actor: () => need().actor,
-    overHandLimit: () => need().overHandLimit,
     handPlayable: () => (menu?.hand ?? []).map((h) => h.playNow !== null),
     async submit(intent: Intent): Promise<boolean> {
       const seq = nextSeq++;