One websocket per project (GatewayConnection, refcounted per endpoint+project,
single reconnect ladder) with per-doc facades: a mini y-websocket client over
varint-channel-tagged frames (y-protocols sync + awareness, own Awareness per
facade so skeleton presence stays per-room). connectProvider's partykit kind
routes every parseable board/presence room through the gateway; the per-room
dial remains only for unparseable operator rooms.
Laziness contract (0001 §5 amendment): sheet-manager warms the hierarchy with
PASSIVE subscriptions — no SyncStep1, no BoardRoom wake; touched hints drive
the parked dirty flag; doSwitch awaits the new provider.activate() sync
barrier before bind/seed; syncLayoutFromSave activates before writing; a stray
local write into a passive doc auto-activates. suberr (invalid-file 409,
presence 403) surfaces as CollabSubRejectedError — terminal in the switch
retry ladder like SexprVersionError, ending the old blind re-dial.
Verified: standalone 346 unit tests green (10 new facade tests incl. the
no-doc-frame passive pin); browser on the dev stack: pcbnew demo = 1 gateway
socket / 0 board-rooms with live collab, eeschema Arduino Leonardo = 2 sockets
total, sub table presence+root active / 3 children passive. tests/web: no
regressions (4 failures reproduced identically without this diff —
pre-existing on the JSPI line; 1 parallel-load flake passes alone).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VLSht9cadprtT2mhynawWu
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