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.

PRERELEASE.md

@@ -27,6 +27,7 @@ the edge before prod. Each phase maps back to the owner's raw pre-release TODO l
 | UI | Tab-bar navigation redesign (drop the hamburger) | owner ad-hoc | **done** |
 | MW | "Multiple words per turn" rule for Russian games (engine v1.1.0) | owner ad-hoc | **done** |
 | MW2 | Single-word rule connectivity fix: the word must run along its own line through an existing tile (perpendicular-only contact no longer connects); single-tile direction picks the best legal word (engine v1.1.1) | owner ad-hoc | **done** |
+| MW3 | Graceful replay degradation: a game whose journalled move became illegal under MW2 is closed as a draw (`end_reason='aborted'`) on open instead of erroring, with an impersonal organizer note in the history + GCG (migration `00002`) | owner ad-hoc | **done** |
 | OW | Open auto-match: enter the game at once and wait inside it (robot after 90–180 s) | owner ad-hoc | **done** |
 | DA | Dictionary admin: online release-archive upload → word-diff preview → install/activate; versioned dict volume; active version persisted in DB; resident label = release tag | owner ad-hoc | **done** |
 | → | Stage 18 — prod contour deploy | — | see [`PLAN.md`](PLAN.md) |