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examples: board — a shared board over a live data source and an optimistic store (#3998)

* examples(board): server module — board store, applied-id acks, ordering, presence

Step 2 of documentation/plans/board-flagship.md: no UI, checked by
examples/board/scripts/check-server.mjs (pnpm check:server).

Co-Authored-By: Claude <noreply@anthropic.com>

* examples(board): read-only board — live source, store, board-level card elements

Step 3 of documentation/plans/board-flagship.md. The document renders the
board; the client adopts those elements and holds the source open.

Co-Authored-By: Claude <noreply@anthropic.com>

* examples(board): writes — create, rename, archive, keyboard moves, per-list errors

Step 4 of documentation/plans/board-flagship.md. Every write is an
optimistic store write held with until() for its acknowledgement on the
board's stream; a refused write undoes itself and reports in its list.

Co-Authored-By: Claude <noreply@anthropic.com>

* examples(board): the slide — cards and lists travel to where they end up

Step 5 of documentation/plans/board-flagship.md. One FLIP effect for a
local move, a remote move and a refused write going back.

Co-Authored-By: Claude <noreply@anthropic.com>

* examples(board): a refused write answers 409, not 500

Co-Authored-By: Claude <noreply@anthropic.com>

* examples(board): keep focus on a card moved by keyboard

A stopgap, in one commit so it can be reverted alone: a moved element
loses focus today. Comes out when the runtime keeps focus on a move.

Co-Authored-By: Claude <noreply@anthropic.com>

* examples(board): drag — cards between lists, list reorder, cancel

Step 6 of documentation/plans/board-flagship.md. Pointer events: a lifted
row follows the pointer, the row it would land before makes room, and the
drop is the same write a keyboard move makes. Checked with a mouse; touch
and edge scrolling are not.

Co-Authored-By: Claude <noreply@anthropic.com>

* examples(board): presence and the reco... (continued)

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