Add Kaiser, Crazy 8s and Wizard

Three more card games, engine to screen.

Kaiser: 32-card prairie trick-taking with bidding, the five of hearts
worth five and the three of spades costing three. Bidding is capped at
ten because ten is all a hand can be worth, and a losing score gives the
game a floor — without one a table that keeps bidding and going down
never reaches a result.

Crazy 8s: eights are wild and name the suit in force, which is why the
table states that suit in words rather than leaving it to be read off
the pile. Blocked rounds are scored rather than hanging.

Wizard: the 60-card deck, one more card dealt each round until the pack
runs out, bid your tricks exactly. The shared card model gains WIZARD
and JESTER ranks, so every ordinary deck now builds from Rank.standard
rather than walking the whole enum.

Also fixes a lobby bug this would have hit: hosting seated the
catalogue minimum rather than the table the host had just set up, so a
six-handed game would have been rejected by its own rules engine.

164 engine tests pass locally.

docs/RULES-crazy8s.md

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+# Crazy 8s — implemented rules
+
+This is the ruleset the engine enforces. Anything marked **toggle** is in the
+game setup screen.
+
+## Table
+
+- 2 to 6 players — **toggle**. Everyone plays for themselves.
+- One 52-card deck.
+- Seven cards each heads-up, five otherwise — **toggle** to fix it at 5, 7 or 9
+  instead.
+- The rest becomes the stock; one card is turned up to start the discard pile.
+  If that card is an eight, the suit it shows is the one in force.
+
+## Play
+
+On your turn, play one card that matches either
+
+- the **suit in force**, or
+- the **rank** of the card on top of the pile.
+
+**Eights are wild.** An eight may be played on anything, and the player names
+the suit that is then in force. This is why the suit in force is stated in words
+on the table rather than left to be read off the pile — after an eight, the top
+card tells you nothing.
+
+If you cannot play:
+
+- **Draw until you can — *toggle*, on by default.** Keep drawing until a
+  playable card turns up, or until there is nothing left to draw.
+- With the toggle off, draw a single card; if it still does not play, the turn
+  passes.
+- When the stock is empty it is rebuilt from the discards, leaving the top card
+  in place. If there is genuinely nothing to draw and nothing to play, you pass.
+
+If every player passes in turn, the round is blocked and ends with nobody out.
+
+## Scoring
+
+The round ends when a player sheds their last card. Everyone else scores penalty
+points for what they were caught holding:
+
+| Card | Penalty |
+| --- | --- |
+| Eight | 50 |
+| Ten, jack, queen, king | 10 |
+| Ace | 1 |
+| Everything else | Face value |
+
+A blocked round is scored the same way — everyone still holding cards pays for
+them.
+
+Lowest total after the last round wins — **toggle** for 1, 3 or 5 rounds.
+
+## What the computer opponent does
+
+It plays the most expensive card it can get rid of, saves its eights until the
+endgame or until it has nothing else, and when it does play one it names the
+suit it holds most of.

docs/RULES-kaiser.md

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+# Kaiser — implemented rules
+
+Kaiser is the prairie game, played hard in Saskatchewan and not much anywhere
+else. This is the ruleset the engine enforces. Anything marked **toggle** is in
+the game setup screen.
+
+## Table
+
+Four players in two partnerships, sitting opposite. Seats 0 and 2 are one team,
+seats 1 and 3 the other.
+
+## The deck — 32 cards
+
+Eight through ace in every suit, plus:
+
+- the **seven of clubs** and the **seven of diamonds**, which are ordinary cards
+  making up the count, and
+- the **five of hearts** and the **three of spades**, which replace the other
+  two sevens and are what the whole game is played for.
+
+Eight cards each, and the deck is exhausted.
+
+## What a hand is worth
+
+Ten points, always:
+
+| Source | Points |
+| --- | --- |
+| Each of the eight tricks | 1 |
+| Taking the five of hearts | +5 |
+| Taking the three of spades | −3 |
+
+So a trick containing the five of hearts is worth six, and one containing the
+three of spades is worth minus two. Both in the same trick is worth three.
+
+## Bidding
+
+Bidding opens to the dealer's left and goes round. Each bid is a number of
+points the bidder's side undertakes to take.
+
+- The floor is **5, 6, 7 or 8** — **toggle**, six by default.
+- The ceiling is ten, because ten is the most a hand can be worth. Bidding
+  above what exists is only a way to guarantee going down, so it is not offered.
+- **No trump** — **toggle**, on by default. A no-trump bid outranks the same
+  number bid with a suit; it pays double and costs double.
+- Each bid must beat the one before it.
+- If the first three players pass, the dealer must bid — there is no throwing
+  the hand in from the dealer's seat. If all four pass (only possible when the
+  dealer's forced bid is somehow not reached), the hand is redealt.
+
+The winning bidder then names trump, or is committed to no trump if that is what
+they bid.
+
+## Play
+
+The bidder leads. Follow suit if you can; otherwise play anything.
+
+There are no bowers — Kaiser ranks straight down from the ace, so the jack is
+just a jack. Trump beats every other suit; otherwise only the led suit can win.
+
+## Scoring
+
+- **Bidding side made it** (took at least the bid): they score every point they
+  took, doubled if the contract was no trump.
+- **Bidding side went down**: they lose the amount of the bid, doubled if it was
+  no trump.
+- **Defenders always keep what they took**, made or not.
+
+First side to the target wins — **toggle** for 32, 52 or 62 points. A side that
+falls to the matching negative score loses outright; without that floor a table
+that keeps bidding and keeps going down never reaches a result at all.
+
+## What the computer opponent does
+
+It rates each suit by trump length and top cards, adds for holding the five of
+hearts and subtracts for holding the three of spades, and bids the floor rather
+than reaching. In play it chases the five of hearts, ducks when the three of
+spades is on the table, and lets its partner have a trick it is already winning.

docs/RULES-wizard.md

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+# Wizard — implemented rules
+
+This is the ruleset the engine enforces. Anything marked **toggle** is in the
+game setup screen.
+
+## Table
+
+- 3 to 6 players — **toggle**. Everyone plays for themselves.
+
+## The deck — 60 cards
+
+An ordinary 52-card pack plus **four wizards** and **four jesters**.
+
+## Rounds
+
+Round 1 deals one card each, round 2 deals two, and so on until the pack runs
+out. That is 20 rounds with three players, 15 with four, 12 with five and 10
+with six. **Toggle** to stop after 5 or 10 rounds instead of playing the lot.
+
+After the deal, the next card off the pack is turned for trump:
+
+- an ordinary card — its suit is trump;
+- a **jester** — the round is played with no trump;
+- a **wizard** — the dealer names trump before anyone bids.
+
+In the last round the whole pack has been dealt, so there is no card to turn and
+no trump.
+
+## Bidding
+
+Starting to the dealer's left, each player says exactly how many tricks they
+will take, from none up to the number of cards in hand. Every bid is heard, so
+the later you bid the more you know.
+
+**Screw the dealer — *toggle*, off by default.** The dealer may not name the
+number that would make the bids add up to the tricks available, so at least one
+player at the table is always going to be wrong.
+
+## Play
+
+The player to the dealer's left leads. Follow the led suit if you hold it —
+except that a **wizard or a jester may always be played**, whatever you hold.
+Playing one is how you get out of following.
+
+**What suit is led:**
+
+- an ordinary card leads its suit;
+- a **jester** leads nothing — the suit is set by the next ordinary card;
+- a **wizard** reaching the front means no suit is led at all, and everyone may
+  play whatever they like.
+
+**Who takes the trick:**
+
+1. The **first wizard** played takes it, whatever else is down.
+2. Otherwise the highest trump.
+3. Otherwise the highest card of the led suit.
+4. A **jester** never wins — except a trick of nothing but jesters, which goes
+   to the first one played.
+
+## Scoring
+
+| Result | Score |
+| --- | --- |
+| Bid made exactly | 20, plus 10 for each trick taken |
+| Bid missed | −10 for every trick over or under |
+
+So bidding none and taking none is worth 20; bidding three and taking three is
+worth 50; bidding three and taking one costs 20.
+
+Highest total after the last round wins.
+
+## What the computer opponent does
+
+It counts its expected tricks — a wizard is one, a jester is none, and
+everything else is a fraction depending on how high it is and whether it is
+trump — and bids the nearest number still on offer. In play it chases tricks
+while it is short of its bid, taking them as cheaply as it can, and ducks once
+it has them, leading a jester when it has one to spare.
+
+Over long runs of self-play it lands its bid exactly around half the time,
+against about one in six for random legal play.