Story phase 4: help when stuck, the arcade opens with the story

- From the third attempt at a checkpoint, the death screen offers TRY
  AGAIN · WITH HELP, at most two tiers, said openly. In the cup the help
  is fresher legs and a longer swing; in gore, one more heart and a
  slower director and horde. Every checkpoint passed resets the offer.
- The arcade shows only what the story has opened. Training and Classic
  open after act I, the Climb after II, Splatter Gore after III, and
  hosting a friend after IV (joining stays free). Locked doors are shown
  greyed with the act that opens them.
- The non-story endings point at the story instead of the cup.
- Store switches for the free tier (act I's card points at the full
  game) and a premium arcade, both off.
- The prologue's HUD no longer overlaps the kill pips.

PROJECT.md logs phases 1-4. One new test. v382, staging only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/config.js

@@ -1043,6 +1043,13 @@ export const STORY = {
   base: act => (act - 1) * 20,
 };
 export const ROMAN = ['', 'I', 'II', 'III', 'IV', 'V'];
+// HELP WHEN STUCK (Oliver: "eine Erleichterung, aber nicht zu easy"): from the 3rd failed attempt at the
+// same checkpoint the death screen offers one tier, at most two, said openly and declinable. Tennis gets
+// the peer gift's shape (legs, swing window); gore one more heart and a slower director per tier.
+export const STORY_HELP = { offerAt: 2, max: 2, run: 0.08, window: 0.12, heart: 1, slow: 0.25 };
+// THE STORE's switches (PROJECT.md "LATER — shipping it"). Both OFF until the unlock IAP exists: the
+// free tier ends on act I's card, and the arcade may become a premium door. premium() is the stub.
+export const STORE = { freeTier: false, arcadePremium: false };
 export const storyAct = act => STORY.acts[Math.max(1, Math.min(5, act)) - 1];
 // the story cup: the league's own round names and needs, on the act's rung order
 export const storyRounds = act => {