[aaylward]

#1668 phase 2.

• GoTerms{size, komi, clock} joins HostedTerms; go's adapter Start is now GoTerms, so a startGame and a challenge are one shape.
• Go opts into kChallenges: challenge: GoStartGame posts terms, the seat that fills the table starts on them, GoView.terms shows them while waiting, and the lobby lists them ("9×9 · komi 5.5 · 1+0").
• Terms no game could open on are refused as posted, via a new public go::CheckRules (the engine's start check minus the seats). Stored terms that fail it read as malformed.
• Stored waiting state: {"terms":{"size","komi","initialMs","incrementMs"}}, pinned both ways beside chess's. Go's engine encoding has no top-level terms.
• ClockLine is shared by chess's and go's lobby lines.

Handicap is not here: the engine has no handicap placement yet.

Rollback: a pre-change binary can't read an open go challenge's row and drops it from the lobby, logged; the row survives and returns on roll-forward.

Tests: //domains/games/... green with Postgres, no skips. Wire goldens pin the challenge command, GoView.terms bytes and the room line, plus in-band bound and rules refusals. The first tests were written with the code, not watched red first. scripts/mutation-check kills every guard instead: capability off, FilledStart, the post-time rules check, the stored-terms check, the view's terms, the lobby line.

Review panel ran; fixups in f97f3d7 (wire goldens, refusal reasons, README and model docs). Kept as is: go's defaults live on GoTerms (chess keeps its defaults in its adapter).

UI: muchq/muchq.github.io#461, to merge after this deploys.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Xae1QBa2qHX32DPVGSq19F

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[cursor]

Review: go takes challenges

Verdict: Approve. Clean #1668 phase-2 cut on the #1678 terms spine: GoTerms joins HostedTerms, go opts into kChallenges, startGame and challenge share one shape, illegal terms refused at post via go::CheckRules, waiting state pinned beside chess. Tip f97f3d76.

What works

Shape. Start = GoTerms with defaults on the struct (19 / 6.5 / 10+5). FilledStart starts the joiner on posted terms. Decode: challenge → CheckRules then PostTerms; startGame → StartGame (open still validates). View carries structured terms while waiting; lobby via TermsLine / shared ClockLine ("9×9 · komi 5.5 · 1+0").

Rules. CheckRules extracted from start setup (board / komi / clock); seats stay in CheckSetup. Challenge refuses at post; TermsFromJson rejects the same set as malformed. Smithy bounds (size 9–19, clock ranges) plus in-band rules (size 10, komi 6.25) both pinned on the wire.

Stored bytes. {"terms":{"size","komi","initialMs","incrementMs"}} write + load→rewrite beside chess; engine encoding still has no top-level terms. TermsLineUp still holds with three alternatives.

Tests. E2e: post shows in room+view, join starts on terms, defaults, rules refusals. Wire goldens for command / view terms / room line (panel f97f3d76). Unit: round-trip + malformed, lobby line, CheckRules. Mutation-check claim covers the guards.

Non-blocking / ops

• Handicap deferred (engine), as stated.
• Rollback: pre-change binary drops open go challenge rows from the lobby (logged); row survives for roll-forward.
• UI Go: a lone seat posts a challenge muchq.github.io#461 after this deploys.
• First tests not watched red (disclosed); mutation-check substitutes.

Tip f97f3d76. Part of #1668.

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[cursor]

CI: f97f3d76

All 24 checks green (build-and-test, asan, ubsan, tsan included). Approve unchanged.