[M4-S3] Place encounters and pickups so the maze teaches #56

Problem

The maze is the tutorial (A14). Its beats are in docs/04 but nothing is placed.

Acceptance criteria

• Left: the chair on the first deck, one rover on the low deck, ladder up, lookout dead end with a muffin
• Center: crab on the high route, two rovers low, the drone over the low route, coffee machine + Dexter at the reconnection, Leberkäse in the cache
• Right: boss gate, Jenny, exit anomaly
• Teaching order: jump → climb → ladders → chair

Notes and dependencies

04 – Rusty Creek, the jam level. Suggested owner: Lex (level design, collision, encounters).

Verification

Someone outside the team reaches the boss gate; note where they got stuck.