fix(social): robot blocks

Blocking an auto-match opponent who is secretly a pooled robot is recorded  instead in a separate `robot_blocks` table.

Now blocking behaves the same in that game (struck name, hidden composer) and lists the blocked opponent under the name you saw, but is recorded only against that game — the disguise holds, the shared robot is never globally blocked, and the matchmaker keeps pairing you with robots (so you can never block yourself out of opponents).

- the shared robot account is never put in `blocks`
- the matchmaker keeps it free and it is not blocked under its other per-game names
- the blocked list and the in-game card still show it by joining that table; an unblock deletes the row

docs/ARCHITECTURE.md

@@ -520,7 +520,12 @@ in either direction (the enqueue excludes the caller's `BlockedWith` set);
   **overrides but does not delete** a friendship (an unblock cleanly restores it), so a pair may
   be friends **and** blocked at once; the admin user card shows the full truth (blocks,
   blocked-by, friends) regardless of this suppression. Block/unblock emit a `user_blocked` /
-  `user_unblocked` notification to the blocker only (§10).
+  `user_unblocked` notification to the blocker only (§10). Blocking an auto-match opponent who
+  is secretly a pooled robot is recorded instead in a separate **`robot_blocks`** table, keyed on
+  the blocker + game + seat with the seen name snapshotted (`BlockInGame`): the shared robot
+  account is never put in `blocks` (so the matchmaker keeps it free and it is not blocked under
+  its other per-game names), while the blocked list and the in-game card still show it by joining
+  that table; an unblock deletes the row.
 - **Friend games**: formed by **invitation → accept** (an `game_invitations`
   record with one row per invitee). The 2–4 player game starts once **every**
   invitee accepts; any decline cancels the invitation, and a pending invitation

docs/FUNCTIONAL.md

@@ -198,7 +198,12 @@ read at once), and a friend request or invitation they send you is kept but neve
 block **overrides but does not delete** an existing friendship (so you may block a friend, and
 they keep seeing you as one); active games are never interrupted — you can finish them, with
 the blocked opponent's chat composer hidden (only the log remains). Blocking from a game card
-mirrors the block in **Settings → Friends**; **unblock** and **unfriend** live there only. Per-game chat is for quick reactions: messages are short
+mirrors the block in **Settings → Friends**; **unblock** and **unfriend** live there only.
+Blocking an **auto-match opponent who is secretly a robot** behaves the same in that game
+(struck name, hidden composer) and lists the blocked opponent under the name you saw, but is
+recorded only against that game — the disguise holds, the shared robot is never globally
+blocked, and the matchmaker keeps pairing you with robots (so you can never block yourself out
+of opponents). Per-game chat is for quick reactions: messages are short
 (up to 60 characters) and may not contain links, email addresses or phone numbers,
 even disguised. You may send **one message per turn, on your own turn**; once it is sent
 the field gives way to a short caption until your next turn. Nudge the player whose turn

docs/FUNCTIONAL_ru.md

@@ -203,7 +203,12 @@ nudge) приходят от бота **этой партии** — по язы
 продолжает видеть вас в друзьях); активные игры не прерываются — их можно доигрывать, при этом у
 заблокированного соперника «подвал» чата скрыт (остаётся только лог). Блокировка с карточки в
 партии повторяет блокировку в **Настройках → Друзья**; **разблокировка** и **удаление из друзей**
-есть только там. Чат
+есть только там.
+Блокировка **авто-матч соперника, который втайне робот**, в этой партии ведёт себя так же
+(зачёркнутое имя, скрытый «подвал») и в списке заблокированных показывается под тем именем,
+которое ты видел, но записывается только для этой партии — маскировка сохраняется, общий
+аккаунт робота глобально не блокируется, и матчмейкер продолжает давать роботов (так что
+заблокировать себя без соперников нельзя). Чат
 партии — для быстрых реакций: сообщения короткие (до 60 символов) и не должны
 содержать ссылок, email и телефонов, даже завуалированных. В свой ход можно отправить
 **одно сообщение за ход**; после отправки поле сменяется короткой подписью до следующего