[aaylward]

Closes #1670.

• games_started{game} and games_finished{game, outcome}, recorded beside the game_started/game_finished lines in their variant/outcome vocabulary. They're declared at zero for every recorded word × outcome (rummy uses kRecordedNames, which a test holds to recordedName).
• prom_proxy: a "Games" group with started/completed/abandoned tiles and abandon_rate. Charts are game_started (fixed) and game_abandon_rate (mean).
• otel_contract: the registry's outcome= values must be the hub's kOutcome*.

Not done:

• Completed/abandoned charts and per-game tile splits. Either would go past the 48-range-query page budget, and the registry has no split primitive.
• Optional ending label and duration histogram.
• UI check in muchq.github.io.

The review panel was not run.

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[cursor]

Review: games started/finished counters by game and outcome

Verdict: Approve. Closes #1670 on the live path: games_started{game} / games_finished{game, outcome} beside the game_* event lines, same vocabulary, declared at zero, wired into prom_proxy's Games group. Tip 18ead762. CI restarting after the rebase onto main.

What works

Hub. CountGameStarted / CountGameFinished sit next to GameStartedLine / GameFinishedLine — open-starts path uses GameKindName, deal-starts / finish use VariantWordOf / FinishedOf, so rummy deals land under rummy/gin and the finish gate (finish && !was_over) is the same one that prevents double-recording. DeclaredCounterSeries walks every adapter; rummy swaps in kRecordedNames ({"rummy","gin"}), held to recordedName by EveryRummyVariantIsRecordedUnderADeclaredWord.

Tests. Declaration list in hub_e2e covers all eight recorded words × both outcomes. Chess e2e pins completed (resign) and abandoned (leave). Registry audit extended for games_* names and outcome=; otel_contract pins prom_proxy's selected outcomes to hub kOutcome*. TestRegistry_GamesHubCountsGamesPlayed locks tile queries and the abandon_rate tile/chart agreement.

prom_proxy. Games group: started / completed / abandoned tiles + abandon_rate mean. Charts stay on budget (game_started fixed, game_abandon_rate mean); completed/abandoned charts and per-game splits correctly deferred as the PR body says. Handler test updated for the 13th group and omitted-last-tile contract.

Non-blocking

• rummy_adapter.h comment names EveryVariantIsRecordedUnderADeclaredWord; the test is EveryRummyVariantIsRecordedUnderADeclaredWord.
• Review panel was not run (disclosed).

Tip 18ead762. Closes #1670.

[cursor]

Tip 3645d181

Comment-only: rummy_adapter.h now names EveryRummyVariantIsRecordedUnderADeclaredWord. Approve unchanged. CI restarting on this tip.