feat: honest AI opponent in quick game

New Game's quick game gains an explicit opponent selector — 🤖 AI (default)
or 👤 Random player. AI starts a game seated with a pooled robot that joins
and moves at once: no per-move timeout (a 7-day inactivity loss reusing the
turn-timeout sweeper), chat/nudge disabled, no statistics, the opponent shown
as 🤖 everywhere. The random path (disguised robot) is unchanged.

Driven by one game flag (games.vs_ai), set only on AI-started games so the
disguised path is never revealed; Matchmaker.StartVsAI seats the robot
directly (no open pool); the robot replies event-driven via the game service's
after-commit/after-create hook. Wire: vs_ai on EnqueueRequest + GameView.

docs/ARCHITECTURE.md

@@ -361,8 +361,24 @@ Key points:
 Substitutes for a human in 2-player auto-match: the matchmaking reaper seats it in an
 open game's empty opponent slot when no human has joined within the wait window (§8).
 It lives in `internal/robot` and plays as an ordinary seated account through the game
-service, so only `internal/engine` imports the solver. It is designed to be
-indistinguishable from a person.
+service, so only `internal/engine` imports the solver. In the random/auto-match path it is
+designed to be indistinguishable from a person.
+
+The same robot serves **two quick-game modes**, chosen by the player on New Game and recorded
+on the game as **`games.vs_ai`**: the **random** path above (disguised as a person) and an
+**honest-AI** path the player knowingly picks (shown as **🤖**). The mode is a per-game flag,
+never derived from the opponent account, so the disguised path is never revealed. In an
+honest-AI game the robot keeps its per-game strength (`playToWin`) and margin band but **moves
+at once** — no sampled delay, no sleep window, no proactive nudge; chat and nudge are disabled,
+the opponent is shown as 🤖 everywhere, and the game records **no statistics** for either seat
+(practice, like a guest game). The fast reply is **event-driven**: committing a move (or
+creating the game) triggers `robot.DriveGame` immediately via the game service's after-commit /
+after-create hook (`game.Service.SetAITrigger`, a func value so the game package never imports
+the robot package), with the periodic driver as the fallback. There is **no short move
+timeout**; instead the game is created with `turn_timeout_secs = AIInactivityTimeout` (**7
+days**) and the existing turn-timeout sweeper resigns the overdue seat — since the robot moves
+at once, only the human is ever on the clock, so the per-turn timeout doubles as the
+"abandoned after 7 days of inactivity → loss" rule with no new column or sweeper.
 
 The robot keeps **no per-game state**: every choice is derived deterministically
 from the game's bag `seed` (a restart-stable FNV-1a mix), so a background driver
@@ -406,8 +422,12 @@ English game the Latin pool.
 
 ## 8. Lobby & social
 
-- **Matchmaking**: auto-match drops the player **straight into a real game and lets
-  them wait inside it**. `Enqueue` (`POST /lobby/enqueue`) opens a game seating the
+- **Matchmaking**: a quick game offers **two opponents** on New Game — an **honest AI** (the
+  default) or a **random** human (§7). The AI choice (`vs_ai` on `POST /lobby/enqueue`) takes the
+  `Matchmaker.StartVsAI` path, which picks a pooled robot and creates a game **already seated and
+  active** (`vs_ai`, random seat order); it never enters the open pool, so the reaper below never
+  touches it. The random choice drops the player **straight into a real game and lets
+  them wait inside it**: `Enqueue` (`POST /lobby/enqueue`) opens a game seating the
   caller with an **empty opponent seat** (status `open`, §9), or — when another player
   is already waiting for the same `variant` and per-turn rule — seats the caller into
   that open game and starts it; which seat the caller takes is randomised for

docs/FUNCTIONAL.md

@@ -84,8 +84,14 @@ Russian → Scrabble + Erudite; a bilingual service shows all three, and the web
 unrestricted). Variants are shown by their **display name** — both Scrabble variants read
 "Scrabble"/"Скрэббл" and Erudit reads "Erudite"/"Эрудит" (by the interface language), and
 the same name titles the in-game screen. This gates only **starting** a new game — both auto-match and a friend
-invitation — so a player still sees and plays existing games of any language. Auto-match
-(always 2 players) drops you **straight into the game and you wait inside it**: if it is your turn you
+invitation — so a player still sees and plays existing games of any language.
+
+**Quick game** lets you choose your opponent — an **AI** (the default) or a **random player**.
+With **AI** you start at once against a 🤖 that joins and replies immediately: there is no waiting,
+chat and nudge are off, add-friend is never shown, and the word-check tool still works; instead of a
+per-move clock you lose only after **7 days without a move** (so you can abandon an AI game freely,
+and the AI itself never runs out of time). Choosing a **random player** is auto-match
+(always 2 players), which drops you **straight into the game and you wait inside it**: if it is your turn you
 can already move, otherwise you watch your tiles. While no opponent has joined, the opponent card (and
 the game's row in the lobby) reads **"searching for opponent"**, and resign, chat and nudge are
 unavailable. Another player searching the same variant and rule joins your game; failing that, a robot
@@ -142,6 +148,12 @@ carries a human-like, language-appropriate name (a Russian game draws mostly Rus
 names); it does not chat, and **silently ignores friend requests** — a request to a
 robot stays pending and expires, exactly like a human who never responds.
 
+The same robot also backs the **honest-AI quick game** the player chooses directly (above). There
+it makes no pretence: it is shown as **🤖** everywhere, joins and moves at once (no thinking time
+or night pause), keeps the same strength (it still plays to win only about 40% of the time), and
+chat, nudge and add-friend are off. AI games are **practice** — they never count toward a player's
+statistics.
+
 ### Social: friends, block, chat, nudge
 Become friends in two ways: redeem a **one-time code** the other player issues (six
 digits, valid for twelve hours), or send a **request to someone you have played

docs/FUNCTIONAL_ru.md

@@ -87,7 +87,14 @@ nudge) приходят от бота **этой партии** — по язы
 читаются как «Scrabble»/«Скрэббл», а Erudit — «Erudite»/«Эрудит» (по языку интерфейса),
 и это же имя выносится в заголовок экрана игры. Это ограничивает только **старт** новой игры — и авто-подбор, и
 приглашение друга, — поэтому игрок по-прежнему видит и играет существующие игры на
-любом языке. Авто-подбор (всегда 2 игрока) сразу **помещает вас в игру, и вы ждёте соперника прямо
+любом языке.
+
+**Быстрая игра** даёт выбрать соперника — **ИИ** (по умолчанию) или **случайного игрока**. С **ИИ**
+вы сразу начинаете против 🤖, который присоединяется и отвечает мгновенно: ожидания нет, чат и nudge
+выключены, «добавить в друзья» не показывается, а проверка слова работает; вместо лимита на ход вы
+проигрываете только после **7 дней без хода** (так что ИИ-партию можно спокойно забросить, а сам ИИ
+никогда не «просрочит» ход). Выбор **случайного игрока** — это авто-подбор (всегда 2 игрока), который
+сразу **помещает вас в игру, и вы ждёте соперника прямо
 в ней**: если ваш ход — вы уже можете ходить, иначе просто рассматриваете свои фишки. Пока соперник не
 присоединился, на карточке соперника (и в строке игры в лобби) написано **«Поиск соперника...»**, а
 сдача, чат и nudge недоступны. Другой игрок, ищущий тот же вариант и правило, присоединяется к вашей
@@ -146,6 +153,11 @@ nudge) приходят от бота **этой партии** — по язы
 **молча игнорирует заявки в друзья** — заявка роботу остаётся в ожидании и истекает,
 ровно как у человека, который не отвечает.
 
+Тот же робот стоит и за **честной игрой против ИИ**, которую игрок выбирает напрямую (выше). Там он
+не притворяется: везде показан как **🤖**, присоединяется и ходит сразу (без раздумий и ночной
+паузы), сохраняет ту же силу (по-прежнему играет на победу лишь примерно в 40% партий), а чат, nudge
+и «добавить в друзья» выключены. Партии с ИИ — это **тренировка**: они не идут в статистику игрока.
+
 ### Социальное: друзья, блок, чат, nudge
 Подружиться можно двумя способами: погасить **одноразовый код**, который выпускает
 другой игрок (шесть цифр, действует двенадцать часов), либо отправить **заявку

docs/UI_DESIGN.md

@@ -227,7 +227,9 @@ IV 🏅; active games show Your move 🟢 / Opponent's move ⏳; invitations use
   Decline for an invitee and a waiting/Cancel state for the inviter; a single-word-rule
   invitation adds a **"One word per turn"** line to the card. Creating a game lives in
   `NewGame.svelte`: **"Play with friends"** (pick invitees, then variant / move time /
-  hints) and **auto-match** (random opponent). The auto-match variant plaques are
+  hints) and **quick game**. Quick game opens with a two-button **🤖 AI / 👤 Random player**
+  segmented select (the `.seg`/`.opt` style, **AI the default**) in place of the old subtitle — AI
+  is an honest robot you knowingly play, Random player is auto-match against a human. The variant plaques are
   **mutually-exclusive selects** — a tap **highlights** one (an accent inset border) instead
   of starting a game; a lone offered variant is pre-selected, and a bottom **Start game**
   button (disabled until a variant is chosen) confirms. For a **Russian** variant (either
@@ -237,7 +239,11 @@ IV 🏅; active games show Your move 🟢 / Opponent's move ⏳; invitations use
   opponent's score card (and the game's lobby row) reads the localized **"searching for opponent"**
   placeholder, the add-friend 🤝 is hidden, and resign and the chat's send/nudge are disabled; an
   **opponent_joined** push restores them in place when a human or robot takes the seat, and a line
-  under Start game notes the wait can take a while (the app may be closed meanwhile).
+  under Start game notes the wait can take a while (the app may be closed meanwhile). With **AI**
+  selected there is no wait: the move-clock line instead reads **"Loss after 7 days of inactivity"**
+  and the "searching" hint is hidden; the game starts already seated, the opponent shows as **🤖**
+  everywhere (score card, lobby row, turn line), the add-friend 🤝 is never drawn, and the chat's
+  send field and 🛎️ nudge stay **disabled** while the 🔎 dictionary word-check keeps working.
 - **Statistics** (`screens/Stats.svelte`, the lobby 📊 tab): a 2-column grid of stat
   cards (wins / losses / draws / games / win-rate / best game / best move) — pure
   numbers, no charts.