Plan the story mode in five phases

Oliver settled the last questions: a prologue with the old
transformation, the racket zombie as an ordinary body in story chapters,
endless arcade gore keeps its duel, and the arcade unlock order. The
code survey's constraints are recorded: the cup runs in splatter under
an interlude, restartRun wipes G, runGames counts through the cup,
bosses are keyed on chapters, duels fire from two triggers, and cupWon
freezes the world. Phases: the spine, the transformation and prologue,
the screens, help/arcade/unlocks, then metal. v379 (docs only).

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

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