rummy: take down into the discard pile; a score sheet

[aaylward]

Changes from play-testing 7-card rummy.

Taking down into the discard pile (7-card and 10-card, not gin)

• A draw can take the top card, or every card from the top down to a named card. Taking more than one card commits the player to meld or lay off the deepest card taken before they can discard.
• A take-down is only allowed if that deepest card could actually be played. It can be melded from the hand plus the cards taken, or laid off onto a table meld, including after other cards bridge the gap (playable in meld.h).
• The view now carries:
  • discardPile: the whole pile, bottom to top.
  • discardTakeable: the cards the viewer could take down to right now.
  • mustPlay: the card that still has to be played.
• drawDiscard now takes an optional card. Gin refuses anything but the top card.
• A player who leaves while owing a card takes the obligation with them.

Score sheet

• The table records every finished deal: variant, winner (none for a gin draw) and points.
• standings[].points is each seat's total. The view carries the sheet as scoreSheet.
• The sheet is stored as an optional scoreSheet key in the v2 table row. A hub that predates it ignores the key, so a rollback keeps every table and only loses its sheet.

Unrelated fix: leaving the room while seated at a table

• The hub sent roomLeft before the table's leave events and a room state. The client re-entered the room from that late state, rewrote the URL back to the room, and got "not in room" on its next command.
• roomLeft is now the last frame the leaver gets. LeavingTheRoomFromATableEndsOnRoomLeft pins this.

Verified

• The rummy lib and games_hub test suites (including the PG suites) pass locally.
• Mutation checks covered the must-play refusal, the take-down check, the check that the owed card has been played, the reset when the owing player leaves, and scoring a deal onto the sheet. Every mutant was killed.
• Played in a browser against muchq.github.io's UI PR: a take-down, the must-play hint, a full deal onto the score sheet, and leave-room from a table.

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Generated by Claude Code

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