[squad:plan] Tidewright M2 Vertical slice and M3 Playable demo (Fenster) #66114

Owner: Fenster (with Verbal for art integration).

• M2: one polished level with final art, animation, sound, undo/restart, star rating.
• M3: 12 levels, tutorial flow, local save/resume, settings (colorblind palette, sound toggle), touch support.
• Acceptance: a new player can finish the demo with no outside help.
  Related to [squad:plan] Tidewright: tide-timed sandcastle defense puzzle game plan #66113

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• expires on Oct 7, 2026, 4:00 AM UTC-08:00