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.

ui/src/lib/i18n/en.ts

@@ -81,6 +81,7 @@ export const en = {
   'game.won': 'You won',
   'game.lost': 'You lost',
   'game.tied': 'Draw',
+  'game.abortedNote': 'This game could not be continued by the organizer and was ended in a draw.',
   'game.checkWordPrompt': 'Enter a word',
   'game.wordLegal': '“{word}” is valid',
   'game.wordIllegal': '“{word}” is not valid',