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

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## v0.45.0 — 2026-09-21 21:12
+- **Broken planes cannot fly (ISS-089).** A plane at `health ≤ 0` is now grounded until repaired instead of flying on fumes: `flyPlane` (`lib/game/actions.ts`) rejects it with 409 `the plane is broken (health 0) — repair it first` BEFORE any auto-refuel math, so fuel and cash stay untouched; the engine's auto-chain (`deliverPackages`, `lib/sim/engine.ts`) skips chaining when a landing's wear breaks the plane — it stays grounded at the arrival airport with its queue kept intact for a later dispatch (same shape as an unaffordable top-up)
+- **Repair is gradual.** `repairPlane` no longer jumps health to 100 — it grounds the plane in `'repairing'` with the gate at `clock + REPAIR_DURATION_MS` and leaves health where it was. The engine's `finishRepairs` pass (`lib/sim/engine.ts`) now heals along a linear curve each tick: `health = min(100, max(startHealth, round(f × 100)))` with `f` the fraction of the repair duration elapsed — monotonic (never drops below the start value), and the flip to `'available'` at exactly 100 happens when the gate passes. The left-pane health bar doubles as the repair progress indicator; no UI change
+- **REMOVED the broken-plane ×1.5 burn mechanic.** `BROKEN_BURN_MULTIPLIER` + `conditionBurnMultiplier()` are deleted from `lib/game/catalog.ts` and every burn site reverts to plain wind-adjusted consumption: `flyPlane` dispatch requirement, engine landed fuel + auto-chain next-leg check (`lib/sim/engine.ts`), the live in-flight gauge (`livePlane`, `lib/game/state.ts`). The mechanic was unreachable anyway — broken planes can no longer depart
+- **Docs.** OpenAPI reworded to match: fly's 409 lists the broken case, queue/repair descriptions + the `PlaneState.health` field note the gradual heal and the cannot-fly rule; route comment in `app/api/planes/[planeId]/repair/route.ts` updated. No endpoints added or removed — count pins unchanged
+- **Tests.** Unit: new `flyPlane` broken-guard test (409 + fuel/cash untouched) and a worn-but-not-broken control; the ×1.5 broken-burn tests deleted (`lib/game/catalog.test.ts`, `lib/game/actions.test.ts`, `lib/sim/engine.test.ts`) in favor of an engine chain-stop test (a plane that lands broken stays grounded with its queue intact despite enough fuel) and a `finishRepairs` curve test (mid-repair climb to `round(f × 100)`, floor at the start value, exact 100 + `'available'` at the gate); `repairPlane` unit pins updated — health is NOT restored by the action itself. E2E: `e2e/maintenance.spec.ts` reworked per the issue — force broken → pill shows AND dispatch 409s with the tank untouched (the ×1.5 burn flight leg is gone) → click Repair → "in repair" pill with health still ~0 → shorten the gate via the hook → back to service at exactly 100; `e2e/right-pane.spec.ts` drops the dead condition factor from its auto-refuel math
+
 ## v0.44.0 — 2026-09-21 17:10
 - **World airport dataset (ISS-079).** `data/airports_eu.csv` (242 EU rows) is replaced by `data/airports_world.csv` — the full OurAirports world dump curated to one marker per metro area: keep `large_airport` rows only, then greedy 40 km haversine clustering with one airport kept per cluster ("biggest" proxy: scheduled service → IATA code → Wikipedia page → file order; no pax data exists in the CSV). Result: **1174 large airports worldwide → 1119 kept, 55 dropped into 52 multi-airport clusters** (e.g. Newark ← JFK + LaGuardia, Dallas ← DFW, Warsaw Chopin merged with Modlin). New committed generator `scripts/build-world-airports.mjs` re-derives the CSV from the source mirror (aborts on download failure; asserts EDDF/UNNT/LPPD presence, unique ICACOs, sane row count)
 - **Loader.** `lib/airports.ts` reads the world file and drops the continent check (type filter kept as a guard); new load-time guard throws on duplicate ICAO — three consumers key features by ICAO with silent-overwrite semantics, so duplicates would corrupt state silently