Record the agreed story mode plan

Five acts, one per league and court: the league cup, the beaten finalist
growing into the act boss and running off, then a ten-game gore chapter
with a mid-boss checkpoint. No duel in the story, healing and restock
after the mid-boss, the act as the saved unit with three checkpoints,
help after the third failed attempt, arcade limited to unlocked modes,
metal in gore only (track pending). Nothing built yet; the storyboard
link and the open questions are in PROJECT.md. v378 (docs only).

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

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