feat(game): void unreplayable games as a draw instead of erroring

A committed move that becomes illegal under a tightened rule (the single-word
connectivity fix) makes engine replay fail, which left such games unopenable —
an empty screen and an 'illegal play' error. Now the first open closes the game
gracefully as a draw (engine.EndAborted -> end_reason 'aborted', no winner),
preserves the journal, and surfaces an impersonal organizer note at the end of
the move history and in the GCG export.

- engine: EndAborted + Abort() (draw, no rack adjustment; winner -1).
- service: replay aborts on ErrIllegalPlay; liveGame persists the void once
  (lazy, on open); GameState re-reads for the settled view.
- store: VoidGame finishes the game and stamps a draw without a journal row.
- migration 00002: allow end_reason 'aborted'.
- ui: organizer note under the history grid; i18n en/ru.
- docs: ARCHITECTURE 6/9.1, FUNCTIONAL(+ru), PRERELEASE MW3.

docs/FUNCTIONAL.md

@@ -177,6 +177,10 @@ would leak the move journal), and the client shares the `.gcg` file where the
 platform supports it, otherwise downloads it. Statistics (durable accounts only):
 wins, losses, draws, max points in a game, and max points for a single move (the
 best play, which already includes every word it formed plus the all-tiles bonus).
+A game that can no longer be continued — because a rule changed and an earlier
+move would now be illegal — is closed as a **draw** the moment someone opens it,
+never left stuck on an error: the move history shows an impersonal organizer note
+at its end (the game could not be continued), and the same note rides the GCG export.
 
 ### Administration
 Operators reach a server-rendered admin console at `${DOMAIN}/_gm` — the backend