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/right-pane.spec.ts

@@ -18,7 +18,8 @@ import { STARTING_REPUTATION } from '../lib/game/seed';
 // 150% of the leg requirement at exactly its rep-discounted cost (ISS-082). Packages are created via
 // POST /api/test/create-package (FLIGHT_TEST_HOOKS=1), same pattern as e2e/actions.spec.ts.
 
-const SCALE = 1000; // fastest sim speed (v0.14.0 ladder top) — keeps flights to seconds of real time
+const SCALE = 1000; // test rate for fast-forwarding legs — keeps flights to seconds of real time
+const WORLD = 24; // the fixed world rate (ISS-117) — must match lib/worldClock.ts
 const HUB = 'EDDF'; // must match HUB_ICAO in lib/game/seed.ts
 
 interface PlaneState {
@@ -57,7 +58,7 @@ interface CatalogEntry {
 
 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: PlaneState[];
   packages: PackageState[];
   catalog: CatalogEntry[];
@@ -74,24 +75,18 @@ async function getState(page: Page): Promise<StateBody> {
   return (await res.json()) as StateBody;
 }
 
-async function postSim(page: Page, body: unknown) {
-  return page.request.post('/api/sim', { data: body });
-}
-
-// Set the time scale and VERIFY from the response that it stuck — a silent reset would
-// otherwise surface as an unexplained landing-wait timeout. ISS-041 also clears pause: a
-// landing pauses the sim, so any fast-forward after one must resume it or the clock stays frozen.
+// Test hook (FLIGHT_TEST_HOOKS=1): set the world rate and VERIFY from the response that it stuck —
+// a silent reset would otherwise surface as an unexplained landing-wait timeout.
 async function setScale(page: Page, scale: number): Promise<void> {
-  const res = await page.request.post('/api/sim', { data: { timeScale: scale, paused: false } });
+  const res = await page.request.post('/api/test/set-timescale', { data: { timeScale: scale } });
   expect(res.status()).toBe(200);
   const body = (await res.json()) as { timeScale: number };
-  expect(body.timeScale, `timeScale should be ${scale} after POST /api/sim`).toBe(scale);
+  expect(body.timeScale, `timeScale should be ${scale} after POST /api/test/set-timescale`).toBe(scale);
 }
 
-// Leave the live instance in a sane state for the other specs (scale 1, running).
+// Leave the live instance in a sane state for the other specs (the fixed world rate).
 test.afterEach(async ({ page }) => {
-  const res = await postSim(page, { timeScale: 1, paused: false });
-  expect(res.status()).toBe(200);
+  await setScale(page, WORLD);
 });
 
 // Mirrors haversineKm in lib/geo.ts (same formula → identical floats).
@@ -168,9 +163,8 @@ async function flyHomeViaApi(page: Page): Promise<void> {
       .toBe(true);
   }
   if (starter.locationIcao !== HUB) {
-    // ISS-041: the landing above paused the sim — setScale clears pause so the return leg
-    // fast-forwards instead of taking real-time hours. ISS-082: dispatch auto-refuels, so a
-    // grounded plane can always start any full-tank-flyable leg when cash allows — no top-up retry needed.
+    // Make sure the world rate is back at SCALE so the return leg fast-forwards. ISS-082: dispatch
+    // auto-refuels, so a grounded plane can always start any full-tank-flyable leg when cash allows — no top-up retry needed.
     await setScale(page, SCALE);
     const flyHome = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } });
     expect(flyHome.status()).toBe(200); // repositioning needs no package (v0.12.0 manual flight)
@@ -274,9 +268,15 @@ test('on-board list: fly-to-destination + abandon with penalty preview; flying p
   await expect(onboardRow, 'loaded package appears in the on-board list').toBeVisible({ timeout: 15_000 });
 
   // The abandon button previews the exact penalty at the snapshot's clock (same formula as the server).
-  // Freeze the clock first so every snapshot — mine and the UI's last poll — shares one clock value,
-  // making the preview deterministic instead of racing the 1 s poll loop.
-  await postSim(page, { paused: true });
+  // The fleet is grounded here (the starter just loaded; workers:1 and every spec's cleanup leave no
+  // other planes), so idle-pause (ISS-117) freezes the clock — verify it actually did, so every
+  // snapshot (mine and the UI's last poll) shares one clock value instead of racing the 1 s poll loop.
+  const frozenClock = (await getState(page)).simState.clockMs;
+  await new Promise((r) => setTimeout(r, 1_500)); // > one background-tick interval
+  expect(
+    (await getState(page)).simState.clockMs,
+    'world should be frozen while the fleet is idle (ISS-117)',
+  ).toBe(frozenClock);
   const state = await getState(page);
   const expectedPenalty = penaltyFor(pkg.reward, pkg.createdSimTime, pkg.deadlineSimTime, state.simState.clockMs);
   await expect(page.getByTestId(`abandon-penalty-${pkg.id}`)).toContainText(eur(expectedPenalty));
@@ -297,8 +297,7 @@ test('on-board list: fly-to-destination + abandon with penalty preview; flying p
   expect(body.planes.find((p) => p.id === 'plane-starter')!.status).toBe('flying');
   expect(body.planes.find((p) => p.id === 'plane-starter')!.destIcao).toBe(nearest.icao);
 
-  // Resume and fast-forward to arrival (poll the authoritative state).
-  await postSim(page, { paused: false });
+  // Fast-forward to arrival (poll the authoritative state) — the takeoff above unfroze the world.
   await setScale(page, SCALE);
   await expect
     .poll(async () => {
@@ -313,8 +312,7 @@ test('on-board list: fly-to-destination + abandon with penalty preview; flying p
   expect(body.packages.find((p) => p.id === pkg.id)?.status).toBe('delivered');
   await expect(onboardRow).not.toBeVisible({ timeout: 15_000 });
 
-  // Restore: fly home so the live instance stays in its onboarding state for the next run.
-  // ISS-041: the arrival above paused the sim, so re-set SCALE for this leg (setScale clears pause).
+  // Restore: fly home at SCALE so the live instance stays in its onboarding state for the next run.
   await setScale(page, SCALE);
   const homeRes = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } });
   expect(homeRes.status()).toBe(200);