Encapsulate games under games/ with catalog session identities

[bramcohen]

Summary

• Move each game into games/<key>/{clsp,rust,ui} behind a portable games/host contract and games/registry.json.
• Keep catalog keys (calpoker, spacepoker, krunk) in the JS session model and IndexedDB; factory hashes stay on the WASM propose/notify boundary.
• Make lastTerms null until a hand is agreed so compose drafts and last terms persist independently and round-trip.

Test plan

• pnpm --filter chia-gaming-fe run test
• ./ct.sh (or CI) for Rust/simulator coverage
• Fresh local session: compose an unsubmittable draft, reload, confirm it restores and lastTerms stays null
• Play one hand, reload mid-session, confirm catalog gameType in the save and the game remounts
• Propose/accept across bind/warmup so ProposalMade is held until protocol identities are ready

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Note

High Risk
Touches session persistence (envelope v15), proposal/identity mapping at the WASM boundary, and the entire game UI/lifecycle path. A mismatch in catalog vs protocol IDs or pending-candidate handling can break play and restore.

Overview
Turns games into self-contained packages under games/<key>/{clsp,rust,ui}, registered only in games/registry.json. Rust and frontend wiring, CLVM compile, presets, and tests are generated from that catalog. Core no longer special-cases Calpoker/Krunk/Space Poker when composing or reviewing.

Identity split: JS saves and the session model keep catalog keys (calpoker, spacepoker, krunk). The wire/WASM game_type is the first generated member’s initial_validation_program_hash, filled by factory warmup on page load (protocolIdForCatalog / catalogGameTypeFromWire).

Host contract: Packages implement GamePackage via games/host (HandProposal, factory-parameter codecs, durableState, one render(view) mount). Gameplay RxJS events are gone; the machine applies five inputs (hand-started, opponent-moved, game-message, move-rejected, hand-ended) and games dispatch GameIntent. Queued local actions persist as pending candidates separate from canonical handState until host-only LocalActionApplied.

Persistence: Session envelope is now v15 (WASM schema 6). Compose drafts live under drafts; last/retry/proposal-group terms become HandProposal and stay independent of the compose draft (null until a hand is agreed). Incompatible alpha records are still dropped, not migrated.

Adds GAME_WRITING_GUIDE.md as the add-a-game checklist.

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