feat(server-mode): pane presence and typing audit (sharing phase 4)

A pane's tab shows the other people who have it open (pane-presence.js,
in memory, fed by the /ws-pty attach; GET /api/lanes/:id/presence and the
pane_presence broadcast to the owner and full collaborators) and says
"Billed to <name>" for a pane a collaborator opened (startedBy on the run).
The first real keystroke of each attach into a shared workspace's pane by
anyone but its owner is audited as `type into <run id>` (mouse, focus and
terminal replies to tmux do not count). The pty socket now pings, so a
vanished browser is ended at the next re-check and leaves the presence list.
This commit is contained in:
2026-11-06 11:32:25 +07:00
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# Workspace & session sharing — plan
Status: **phases 1–3 built 2026-11-06** (workspace sharing; collaborators run on their own account, billed per payer by hour — `session_payers`; one session can be shared — `session_shares`; R1 decided as option **(a)** — accept and warn hard). Phase 4 not built.
Status: **phases 1–4 built 2026-11-06** (workspace sharing; collaborators run on their own account, billed per payer by hour — `session_payers`; one session can be shared — `session_shares`; pane presence + typing audit; R1 decided as option **(a)** — accept and warn hard).
An independent review of phase 1 found and got fixed: a collaborator's Terminal
tab acted as the owner through its pane token (now `dashboard_runs.started_by`),
`POST /api/run {shell:true}` bypassed `ECOLLABSTART`, a disabled collaborator