Fix parking trains, freight deadlock, and Whistle Post lock-in

test/sim.test.ts

@@ -287,3 +287,34 @@ describe('switching accomplishes something (regression)', () => {
     assert.ok(moves < 60, `${moves.toFixed(0)} Moves per game suggests aimless shuttling`);
   });
 });
+
+describe('measurement discipline', () => {
+  it('the observer sees exactly the events the log records', () => {
+    // REGRESSION, against a measurement bug rather than a game bug. Events reach the log from TWO
+    // sources — the phase driver (`pump`) and player intents (`applyIntent`). An ad-hoc probe that
+    // watched only the first reported "60 of 60 games never upgraded past Whistle Post" while the
+    // Office tier histogram from the same run plainly showed Depots, Stations and Terminals.
+    //
+    // A wrong measurement is worse than a missing one: it gets believed and acted on. This asserts
+    // the observer hook cannot drift from the log, so probes have one trustworthy way in and no
+    // reason to hand-roll the drive loop again.
+    const seen: string[] = [];
+    const s = createGame({ id: 'obs', seed: 4242, config: { ...config, length: 'standard' }, playerNames: ['b'] });
+    const out = playGame(s, developerBot, pump, 50_000, (e) => seen.push(e.type));
+
+    assert.ok(out.events.length > 0, 'a finished game must produce events');
+    assert.deepEqual(seen, out.events.map((e) => e.type));
+  });
+
+  it('records office upgrades where a probe can actually find them', () => {
+    // The upgrade arrives via applyIntent, not pump — the exact branch the broken probe missed.
+    // Asserted across several seeds because a single game may never draw a Depot card.
+    let upgrades = 0;
+    for (let seed = 0; seed < 25; seed++) {
+      const s = createGame({ id: `u${seed}`, seed, config: { ...config, length: 'standard' }, playerNames: ['b'] });
+      const out = playGame(s, developerBot, pump);
+      upgrades += out.events.filter((e) => e.type === 'officeUpgraded').length;
+    }
+    assert.ok(upgrades > 0, 'no office upgrade was visible in the event log across 25 games');
+  });
+});