[aaylward]

Part of #1668 (the "Also" item on dead-stone marking).

Until now, players had to capture dead groups before passing. Now two passes open a scoring phase instead of ending the game.

• markDead {x,y} (either seat) marks the group at that point dead, or alive again. Each mark withdraws both acceptances.
• Once both seats accept, the game ends on Tromp-Taylor area scoring, with dead stones counted as empty.
• The side to move can play a stone to drop the marks and play on. A pass during scoring is refused.
• The side to move's clock keeps running throughout, so neither seat can stall the scoring.
• View: phase scoring, dead points, and scoring {acceptedBy, score} (the count as it stands).
• Stored row: optional dead and accepted. Older rows still restore.

Tests cover the engine, serde round-trip and legacy rows, the e2e accept-and-mark flow, and the wire goldens.

Deploy order: merge muchq/muchq.github.io#455 first. A client from before this change can't leave the scoring phase.

The review panel was not run.

🤖 Generated with Claude Code

https://claude.ai/code/session_01PF5CZafkFhmkCfxasKpme9

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Review: mark dead stones and accept before area scoring

Verdict: Approve. Right shape for #1668's dead-stone item: two passes open scoring instead of ending; either seat marks whole groups (toggle, clears both acceptances); both accept ends on Tromp-Taylor with dead counted as empty; side-to-move can play on (drops marks) and its clock runs the whole time. Tip d6718610. All 24 checks green.

What works

Engine. scoring() = two passes and not over. markDead / accept gated by checkScoring; pass in scoring refused; placed clears marks when playing on. Score paints dead points empty then area-counts. Restore validates ascending whole groups, refuses both-accepted-still-open and score-without-two-passes, and still reads pre-marking rows (optional dead / accepted). Clock: mark/accept do not reset turn_started_ms; timeout/flag still win during scoring — pinned.

Adapter / wire. Phase scoring; dead points and scoring {acceptedBy, score} on the view; WireScore shared with the result. Decode wires markDead / accept. Command series + hub_e2e declarations updated. E2e covers mark-withdraws-acceptance and double-accept end; wire golden covers mark/unmark and acceptances; engine tests cover group mark/revive, play-on, clock-through-scoring, restore refusals.

Serde. Writes dead / accepted only when non-empty/true; legacy scored rows without those fields restore.

Non-blocking / ops

• Deploy order: go: mark dead stones and accept in the scoring muchq.github.io#455 is still open. As the PR says, merge that first — an old client cannot leave scoring.
• Review panel was not run (disclosed).
• Resign during scoring leaves any marks on the ended state (view may still show dead); score ending is the only path that needs them.

Tip d6718610. Part of #1668.

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CI: d6718610

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

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Tip 59bbb76d

Rebase onto main (#1677/#1678): go scoring unchanged; FilledStart takes HostedTerms with the rest of the adapters. Approve unchanged. CI restarting on this tip.