[squad:plan] Tidewright design and architecture (Keaton) #66119

Owner: Keaton.

• Write the design doc: tile rules, sand budget, tide forecast format, star scoring.
• Define architecture: pure deterministic simulation core separated from the renderer and input layers.
• Specify the level data format (JSON schema) and the save format.
• Acceptance: doc reviewed; module boundaries agreed before M1 starts.
  Related to [squad:plan] Tidewright: tide-timed sandcastle defense puzzle game plan #66113

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• expires on Oct 7, 2026, 4:01 AM UTC-08:00