docs(plan): defer in-game chat, add Phase 1 (Casual) implementation plan
- DECISIONS.md: in-game chat (player↔player and human↔Gemma) deferred indefinitely. Blind-mode chat is a side channel that defeats the moderator-vocabulary security boundary; chat with Gemma leaks belief state mid-game. Resolvable but expensive — revisit only on demand. - Spec: same deferral noted in "Out of scope". - New plan: docs/superpowers/plans/2026-04-28-ai-player-phase-1-casual.md — 13 tasks, 80 sub-steps. Phase 1 only (Casual bot end-to-end). Phase 2 (Recon) gets its own plan once Phase 1 outcomes inform Recon's target. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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