[M2-S5] Coffee machine save point #43

User story

As a player, I want to drink from a coffee machine to save and refill, so that I have safe places in the maze.

Acceptance criteria

• ↑ at the machine: drink, save, refill all cells
• The respawn point updates; the machine flickers while idle

Design and references

02 – Core loop · mensa-drinks board in docs/07.

Dependencies

Suggested owner: Vatsal (player and combat code).

Verification

Save, die, respawn at that machine with full health.