Broken planes cannot fly; repair heals gradually (ISS-089)

- flyPlane 409s a broken plane (health <= 0) before any refuel math — fuel/cash untouched
- engine auto-chain skips chaining when a landing's wear breaks the plane (queue kept intact)
- finishRepairs heals along round(f x 100) each tick; flip to available at exactly 100 on gate pass
- repairPlane no longer jumps health to 100 — it starts the gradual heal
- REMOVED BROKEN_BURN_MULTIPLIER / conditionBurnMultiplier and all burn sites (unreachable now)
- OpenAPI + route comments reworded; unit tests reworked; e2e maintenance.spec.ts per issue
- v0.45.0

lib/game/state.ts

@@ -3,7 +3,7 @@ import { haversineKm, initialBearingDeg } from '@/lib/geo';
 import { weatherFor } from '@/lib/weather';
 import { getGameDb } from '@/lib/db/client';
 import * as schema from '@/lib/db/schema';
-import { conditionBurnMultiplier, catalogEntries, FUEL_PRICE_PER_L, PLANE_TYPES, SELL_FRACTION, type CatalogEntry } from './catalog';
+import { catalogEntries, FUEL_PRICE_PER_L, PLANE_TYPES, SELL_FRACTION, type CatalogEntry } from './catalog';
 import { fuelAtWeighted, progressAt, positionAt, windBurnFactor } from '@/lib/sim/movement';
 
 // Read-only game-state snapshot for client polling (GET /api/state).
@@ -30,7 +30,8 @@ export interface PlaneState {
   // leg is destIcao. The engine auto-chains queue[0] on landing when fuel covers it.
   queue: string[];
   // Structural health in [0, 100] (v0.39.0, ISS-069) — wears down with distance flown; at 0 the
-  // plane is broken and burns BROKEN_BURN_MULTIPLIER × more fuel until repaired.
+  // plane is broken and cannot fly until repaired (v0.45.0, ISS-089). While 'repairing' this is
+  // also the repair progress: it climbs back to 100 over REPAIR_DURATION_MS of sim time.
   health: number;
   // Sim-clock epoch ms when an active repair finishes (v0.39.0, ISS-069); null when not in repair.
   repairUntilSimTime: number | null;
@@ -113,12 +114,10 @@ export async function getStateSnapshot(): Promise<StateSnapshot> {
     const pos = positionAt(from.lat, from.lon, to.lat, to.lon, progress);
     // Wind-adjusted burn (v0.36.0) — weather is a pure function of the departure ICAO, so this
     // recomputes exactly the factor the engine used for the leg; no stored state needed.
-    // v0.39.0 (ISS-069): broken planes burn BROKEN_BURN_MULTIPLIER × more — p.health is frozen at
-    // departure (wear lands only), so this stays bit-consistent with the engine's landed fuel.
     const w = weatherFor(p.locationIcao);
     return { ...pos, fuel: fuelAtWeighted(
       p.fuel,
-      type.burnPerKm * windBurnFactor(w.windKt, w.windDirDeg, initialBearingDeg(from.lat, from.lon, to.lat, to.lon)) * conditionBurnMultiplier(p.health),
+      type.burnPerKm * windBurnFactor(w.windKt, w.windDirDeg, initialBearingDeg(from.lat, from.lon, to.lat, to.lon)),
       type.emptyWeightKg,
       type.maxFuel,
       distanceKm,