v0.8.3 — the engine half of the audit, and the deal 0.8.2 silently changed

Seven rules faults and one dealing fault, from a four-way code audit (engine, server,
client, tests) read against the code before anything was acted on. Each is pinned by a
test that failed first. CHANGELOG has the reasoning; this is the list.

THE DEAL. 0.8.2 put the Second Section card into the deck after its save check had run
and without a line in its notes. A deck one card larger shuffles differently from the same
seed, so every save on the test server refused at move 3 — the boot log shows thirteen of
thirteen — while the release notes said three would resume. `withSavedDeal` (was
`withSavedOpening`) now sets `secondSectionCard: false` for a config that predates the
setting, and the thirteen replay exactly as 0.8.2 described: three resume, ten refuse, the
same ten at the same moves.

THE RULES. `check` never tested that a switching tray was in the actor's own district, so
a rival's train could be shunted and the rival charged the Moves. Occupancy matched on
coordinates alone, so a rival's crew blocked your track. A Department draw that emptied the
deck duplicated the drawn card and destroyed the refill card. The unjam cleared the first
load rather than the one named. The collision floor could not fire in Stage 12. The
Expedite fault was charged once per clearance question rather than once per phase. A train
held at the Limits was only ever released by another arrival, never by a departure.

Docs: rules.md describes each as built (and no longer says an Expedited train departs at
Shift Change — that was v0.4.8's reading, corrected in v0.4.9's code and never in the
document); game-state.md's collision-floor note now matches the code.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FrCWubm9GAftYCm2hWdKwK

test/enhancements.test.ts

@@ -941,3 +941,60 @@ describe('defensive enhancements', () => {
     assert.equal(hasDistrictEnhancement(areaOf(s, 0), 'waterColumn'), false);
   });
 });
+
+// ---------------------------------------------------------------------------
+// v0.8.3 — audit findings (2026-09-29)
+// ---------------------------------------------------------------------------
+
+describe('a train held at the Limits is released when a track frees (v0.8.3)', () => {
+  it('takes a free A/D track at the end of the Mainline Phase without waiting for another arrival', () => {
+    /**
+     * The only release was inside `arriveAtOffice` for a DIFFERENT train — so an Office that
+     * emptied by departures alone kept the held train at its Limits for the rest of the game,
+     * invisible: no transit, not in `adOccupancy`, not counted by the clearance check.
+     */
+    const s = game();
+    const area = areaOf(s, 0);
+    const card = straight();
+    card.enhancements.push('interlocking');
+    addCard(s, at(0, 2), card);
+    s.trays.set('waiting', {
+      id: 'waiting', trainNumber: 8, trainIsExtra: false, engineAt: 0,
+      consist: [], direction: 'east', position: { at: 'mainline', index: 1 }, movesUsed: 0,
+    } as never);
+    area.heldAtLimits = ['waiting'];
+    area.adOccupancy = []; // the Office cleared, and nothing is arriving
+    s.timetable = s.timetable.map(() => null);
+
+    s.clock.phase = 'mainline';
+    const r = advance(s);
+
+    assert.ok(area.adOccupancy.includes('waiting'), 'the held train is still at the Limits with the Office empty');
+    assert.deepEqual(area.heldAtLimits, []);
+    assert.deepEqual(s.trays.get('waiting')!.position, { at: 'grid', seat: 0, coord: area.officeCoord });
+    const released = r.events.find((e) => e.type === 'trainReleasedFromLimits');
+    assert.ok(released, 'the release is silent');
+    const line = narrate(released as never, { playerName: () => 'A' });
+    assert.match(line.text, /RELEASED from the Limits/, line.text);
+  });
+
+  it('still waits while the Office is full', () => {
+    const s = game();
+    const area = areaOf(s, 0);
+    s.trays.set('waiting', {
+      id: 'waiting', trainNumber: 8, trainIsExtra: false, engineAt: 0,
+      consist: [], direction: 'east', position: { at: 'mainline', index: 1 }, movesUsed: 0,
+    } as never);
+    area.heldAtLimits = ['waiting'];
+    area.adOccupancy = ['blocker'];
+    s.trays.set('blocker', {
+      id: 'blocker', trainNumber: null, trainIsExtra: false, engineAt: 0,
+      consist: [], direction: 'east', position: { at: 'grid', seat: 0, coord: area.officeCoord }, movesUsed: 0,
+    } as never);
+    s.timetable = s.timetable.map(() => null);
+    s.clock.phase = 'mainline';
+    advance(s);
+    assert.deepEqual(area.heldAtLimits, ['waiting']);
+    assert.ok(!area.adOccupancy.includes('waiting'));
+  });
+});