Phase 1: add lightweight People Play protocol contract

[shinp-dev]

Phase 1 scope

• Add independent People Play domain models, strict JSON codec, and pure wire validation in core/network.
• Fix protocol version 1 and the six client / four server message types.
• Add shared v1 wire fixtures and the client authorization matrix for later TypeScript use.
• Keep wire placement ply separate from core/game ply and represent DESYNC as NO_CONTEST.

Verification

• :core:network:test — passed.
• test — only the same two pre-existing StandardModeUiContractTest failures seen before implementation; all Phase 1 tests passed.
• lint — passed.
• assembleDebug — passed.
• git diff --check and staged diff check — passed.

Phase 2 implementation is outside this PR.

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	chanriva	1abbd28	Sep 28 2026, 05:33 PM