Add President and Golf

Two more games on the existing framework — no changes were needed to the
lobby, networking, settings or update layers, which is what the shared
GameRules/GameAi contract was for.

President
- Threes low, twos high. Lead any number of one rank; follow with the
  same count of a higher rank, or pass. When everyone has passed the
  pile comes down and the last player to play leads again.
- Toggles: player count, rounds, twos clear the pile, four of a kind
  bombs, and the between-round card exchange.
- Plays are offered as whole sets rather than by selecting cards. A set
  is the unit of the game, so choosing from the legal sets is both
  easier to operate and impossible to get wrong.

Golf
- 4, 6 or 9 card grids. Draw from stock or discard, then either swap the
  card in or — only if it came off the stock — throw it and turn one of
  your own over. A card taken from the discard pile has to be used.
- Matching columns cancel to nothing; on the 3x3 board rows do too, but
  not on the shallower grids where three cards are not a line.
- Face-down cards are hidden from everyone including their owner, which
  is the point of the game: viewFor masks them with a fixed placeholder
  so the real card never reaches the device that has not turned it over.

Both engines are pure Kotlin and unit tested — 71 tests now, covering
ranking, legal moves, pile and hole resolution, scoring, redaction, wire
round-trips, and full random and AI playthroughs. The Golf test also
checks the AI actually beats random play rather than merely being legal.

Also widened the setup screen's option chips to wrap: the reveal-count
row carries up to ten, and a chip off the edge of the screen is a
setting that cannot be changed — the same failure as the Euchre Pass
button.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_015qjfMiPUDshdKEUa6vxqzN

README.md

@@ -9,8 +9,8 @@ The app shell is complete and two games are playable end to end:
 
 | | |
 | --- | --- |
-| **Playable** | Euchre, Sequence |
-| **Listed, not yet implemented** | Kaiser, President, Golf, Wizard, Crazy 8s, Mastermind, Backgammon, Chess, Checkers |
+| **Playable** | Euchre, Sequence, President, Golf |
+| **Listed, not yet implemented** | Kaiser, Wizard, Crazy 8s, Mastermind, Backgammon, Chess, Checkers |
 
 Unimplemented games appear in the menu marked *Coming soon* **on dev builds
 only** — a production release lists just the games that can actually be played,
@@ -145,6 +145,8 @@ game:
 
 - [Euchre](docs/RULES-euchre.md)
 - [Sequence](docs/RULES-sequence.md) — **note the caveat about the board layout**
+- [President](docs/RULES-president.md)
+- [Golf](docs/RULES-golf.md)
 
 ## Layout
 
@@ -154,6 +156,8 @@ game/          rules engines and AI — pure Kotlin, no Android, unit-tested
   engine/      GameRules / GameAi contracts, seats, table config
   euchre/      Euchre model, rules, AI
   sequence/    Sequence model, board, rules, AI
+  president/   President model, rules, AI
+  golf/        Golf model, scoring, rules, AI
 net/           wire protocol, LAN and Bluetooth transports, lobby, match driver
 settings/      DataStore-backed preferences
 update/        GitHub Releases OTA updater