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feat(ws-server): websocket host for one document (improvise-q08)

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A new crate `improvise-ws-server`: a testable session loop plus a thin
tokio/tungstenite shell around it.

The ticket predates the session machinery and describes building it by
hand; most of what it asks for now exists, so what this adds is the
transport and the loop (doctrine(check_the_ticket_premise)):

- `Host` is one authoritative `App`, one `Sessions`, and every client
  attached to them — the unit of authority is the *document*, not the
  connection (the ticket's premise) and not the server. A multi-document
  registry is a map of `Host`s and is deliberately not built yet; the
  seam is in `transport`, where `serve` takes the document it hosts.
- `handle(id, msg) -> Vec<Addressed>` makes every decision and is tested
  without a socket. `Applied::Rebased` sends every client a fresh
  `Snapshot`; `Applied::Diff.broadcast` is forwarded to the *other*
  clients and never back to the asker.
- The wire adds exactly one thing to the shared vocabulary: the extent a
  client can display, which no `Command` carries by construction and
  which doubles as the handshake, since the bootstrap `Snapshot` is
  built at it.

No auth, no TLS, loopback only: a stated MVP limit.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EoW5BB87ZZdm96SvBTWawH
This commit is contained in:
Edward Langley
2026-09-19 16:44:32 -07:00
parent 68d849d409
commit df746173bf
9 changed files with 1375 additions and 5 deletions
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Cargo.lock
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+213 -4
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