Fixed world clock: no player time controls (ISS-117)

The world always runs at WORLD_TIME_SCALE = 24 (lib/worldClock.ts). A server
background tick (instrumentation.ts -> startBackgroundTick, 1 s interval)
advances the sim with no open browser; idle-pause freezes the clock exactly
while no plane is flying or in repair. Fresh worlds start year 2000
(STARTING_CLOCK_MS in seed.ts).

- Removed: POST /api/sim + OpenAPI entry, applyTimeControls/clampTimeScale,
  lib/timeScale.ts, LeftPane pause button + scale slider machinery,
  ISS-057 slow-on-landing/resume in flyPlane.
- Snapshot simState is now { clockMs } only; client extrapolates at the fixed
  rate between polls and freezes while idle (useSimClock).
- New test-only hook POST /api/test/set-timescale behind FLIGHT_TEST_HOOKS=1
  (sibling of set-health); all e2e setScale helpers call it, afterEach restores
  the world rate. E2E pause tests replaced by idle-pause assertions; sim.spec.ts
  activates the world via set-health + /repair for advance/expiry tests.

e2e/state.spec.ts

@@ -10,7 +10,7 @@ const composeArgs = process.env.E2E_COMPOSE_ARGS ?? '';
 
 interface StateBody {
   account: { cash: number; reputation: number };
-  simState: { clockMs: number; timeScale: number; paused: boolean };
+  simState: { clockMs: number }; // ISS-117: the snapshot carries only the game clock
   planes: Array<Record<string, unknown>>;
   packages: Array<Record<string, unknown>>;
 }
@@ -24,9 +24,7 @@ test('GET /api/state returns a seeded snapshot', async ({ page }) => {
   expect(typeof body.account.cash).toBe('number');
   expect(typeof body.account.reputation).toBe('number');
 
-  expect(typeof body.simState.clockMs).toBe('number');
-  expect(typeof body.simState.timeScale).toBe('number');
-  expect(body.simState.paused).toBe(false);
+  expect(typeof body.simState.clockMs).toBe('number'); // ISS-117: time controls are gone — clock only
 
   expect(Array.isArray(body.planes)).toBe(true);
   expect(body.planes.length).toBeGreaterThanOrEqual(1);
@@ -44,6 +42,17 @@ test('GET /api/state returns a seeded snapshot', async ({ page }) => {
 test('state survives a container restart (sim clock + account persisted)', async ({ page }) => {
   test.setTimeout(180_000);
 
+  // Self-heal to a fully grounded fleet first — idle-pause (ISS-117) then freezes the clock, so the
+  // post-restart snapshot must match byte-for-byte instead of within one tick bound.
+  await expect
+    .poll(async () => {
+      const res = await page.request.get('/api/state');
+      if (res.status() !== 200) return 'down';
+      const body = (await res.json()) as StateBody;
+      return body.planes.every((p) => p.status === 'available') ? 'idle' : 'busy';
+    }, { timeout: 120_000, message: 'waiting for the fleet to be fully grounded' })
+    .toBe('idle');
+
   const resBefore = await page.request.get('/api/state');
   expect(resBefore.status()).toBe(200);
   const before = (await resBefore.json()) as StateBody;
@@ -68,15 +77,9 @@ test('state survives a container restart (sim clock + account persisted)', async
   const a = after!;
 
   // The DB file on the volume must be loaded, not re-seeded (PLAN.md: "sim clock
-  // persisted across sessions"): account and entity ids are byte-identical.
-  // v0.7.0 tick-on-read caveat: every GET advances the clock by at most one
-  // clamped tick (MAX_TICK_ELAPSED_MS × timeScale, see lib/sim/engine.ts), so the
-  // post-restart clock may be ahead — but never by more than that bound.
-  expect(a.simState.clockMs).toBeGreaterThanOrEqual(before.simState.clockMs);
-  const MAX_TICK_ELAPSED_MS = 2_000; // must match lib/sim/engine.ts
-  expect(a.simState.clockMs - before.simState.clockMs).toBeLessThanOrEqual(
-    MAX_TICK_ELAPSED_MS * a.simState.timeScale,
-  );
+  // persisted across sessions"): account and entity ids are byte-identical. With the fleet
+  // grounded above, idle-pause keeps the clock frozen across the restart — exact equality.
+  expect(a.simState.clockMs).toBe(before.simState.clockMs);
   expect(a.account.cash).toBe(before.account.cash);
   expect(a.account.reputation).toBe(before.account.reputation);
   expect(a.planes.map((p) => p.id).sort()).toEqual(before.planes.map((p) => p.id).sort());