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* feat(remote): keep a remote workspace whole across reopens and restarts Reopening a remote workspace — or coming back to one whose `tty7-server` had been replaced — landed on a screen of `tty7 — disconnected` panes with their coding-agent conversations gone. Several independent holes added up to that; this closes them together, and picks up the surrounding work the same session produced. **Telling a restarted server from a blinked link.** `ControlHelloOk` now carries an `instance` minted once per server *process*. Nothing else in the handshake changes across a restart — `build` and both dialect numbers survive it — so a reconnect had no way to know its `pane_id`s were dead. It does now: a different instance rebuilds the window from its layout (same tabs and splits, fresh shells in the saved cwds) instead of re-attaching to a process that is gone. An absent instance means *unknown* and is never read as a restart. **An attach can now fail.** `Attach` has no synchronous reply, so the client returned `Ok` unconditionally and the daemon's `Error` frame was read much later by the reader thread, which has no arm for it — the pane then landed in the *link is down* state instead of falling back to a fresh shell. The client now reads far enough into the reply to classify it on the kind byte (the snapshot behind it can be megabytes) and hands those bytes to the reader thread, so a successful attach loses none of its replay. Local and remote attaches get different waits: the local one is on the UI thread. **The agent session survives to be resumed.** `TerminalView` raises `AgentSessionChanged` when the pane's agent reports a new native session id, so the layout on file catches up instead of waiting for the user to happen to open a tab. A pane that is still connecting now carries its agent through `PendingSpawn` — a save landing in that window used to write `agent: null` over the record — and `land_pane` sends `--resume` when the attach turned out to need a fresh shell. **Ending sessions says so on file.** "End Sessions" kills the panes and then drops their ids from the record, pushing the cleared layout to the machine that owns it (design §10: the remote's copy wins, so a local-only clear would be undone by the next open — the open this exists for). **The new-tab dropdown lists the window's machine.** `Host::shells` and a `Shells` control request (dialect v2) make the "+" menu a property of the machine the window is bound to. A remote window filled from this computer's `/etc/shells` offered `/bin/zsh` on a box whose zsh is elsewhere, and every pick failed to spawn. **An install reports its bytes.** The download and the SFTP upload each report progress, relayed to the client over the routed connection as a `RoutePrompt::InstallProgress`, and painted as a bar under the machine's row in the switcher. ~8 MB across two hops behind the word "connecting…" was indistinguishable from a hang. **The installer compares dialects, not version strings.** `tty7-server --protocol` prints what a binary speaks without starting it, so a connect adopts an already-running server it can talk to rather than prompting about a build difference and uploading 8 MB the machine did not need. **Switcher.** A machine's `⋯` menu holds "New Workspace" (it was a row under every machine, pushing the list a quarter of a card down) and a new "Disconnect", which drops the connection and leaves the windows open and read-only. The suspension lasts exactly as long as that machine has a window on it. Also drops three design/contract docs for the now-shipped remote-workspace work. * fix(session): stop one workspace's panes from being restored into another A restart put a copy of one workspace's seven tabs — cwds, layout and recorded agent sessions — in front of another workspace's own tabs, and auto-resumed every one of those agents a second time: six `claude --resume <id>` pairs running in parallel against the same conversations, one set per window. The record-level corruption that seeded it is still unattributed, but every mechanism that let it propagate, amplify, or go unnoticed is closable, and this closes them. **Panes now know their owner.** `Spawn` can carry the workspace the pane is created for; the daemon stores it immutably and reports it in `List`'s `PaneInfo.owner`. Restore refuses to re-attach a pane another workspace owns (`pane_attachable`) — before this, a saved id landing on somebody else's live pane attached silently, which is how one window could pick up another's shells. The field rides a new `SPAWN_OWNED` frame with a struct payload (the legacy spawn payloads are positional tuples an old daemon cannot grow), gated on a new `pane-owner` feature string: a client only sends it to a daemon that advertises it, so the legacy kinds stay byte-for-byte what old daemons expect. A pane with no recorded owner stays attachable by anyone — that is the pre-field behavior, not a new risk. **Saved pane ids are bound to the daemon process that issued them.** `DaemonVersion` now carries an `instance` minted once per process (the local twin of the control hello's), the GUI caches it at the `ensure_running` handshake, and each local workspace records it as `daemon_instance` beside its layout. Claiming a workspace whose ids came from a different instance blanks them first: daemon pane ids restart from 1, so after a reboot every saved id points at whatever unrelated shell holds the number now, and the aliveness check cannot tell a survivor from a squatter. A blank on either side means "cannot tell" and never trips it. Unlike the duplicate-claim case below, this path keeps the agent resume — the pane is genuinely gone with its daemon, and the fresh shell resuming the conversation is the feature. **A duplicate claim loses its agent resume along with its pane id.** `dedupe_pane_ids` kept the loser's layout *and* its `agent_session_id`, so the blanked leaves took restore's spawn-fresh path and auto-typed `claude --resume` for conversations the winning workspace's panes were still running — the doubling above. The winner keeps the panes and the resume; the loser keeps only cwds. **Cross-workspace saves are caught at the write.** Every terminal view remembers the workspace whose window created it, and `save_session` logs an error naming both ids if a window ever records a pane created for a different workspace — the tripwire for the still-unattributed seed corruption, so a recurrence is caught in the act instead of reconstructed from `session.json` archaeology days later. Wire compatibility both ways: `PaneInfo.owner`, `DaemonVersion.instance` and `Workspace.daemon_instance` are `#[serde(default)]` struct fields (old peers' JSON decodes, new fields are ignored by old readers), and `SPAWN_OWNED` is feature-gated as above. `daemon_instance` is client-owned in the design-§10 storage split — it names the local daemon, and the field-census test pins the classification. * fix(session): resume the agent when a local pane dies mid-restore `session_to_pane` decided whether to send a coding agent's `--resume` from `restore.is_none()` — i.e. from whether the pane looked alive when the restore started. But `alive_panes_on` runs one `List` at the top of the restore, while the attaches happen per leaf afterwards. A pane that exited in between failed its attach, fell back to a fresh shell inside `spawn_shell_terminal_in`, and then landed in the `restore.is_some()` arm: an empty shell with its conversation dropped. `ShellParts.restored` already answers this exactly, and the remote path already reads it in `land_pane`. Carry it onto `TerminalView` so the synchronous local path can read it too, and branch on that instead of re-deriving the answer from a set that may be stale by the time it is used. No behaviour change on the paths that were already correct: a view that was never restoring anything reports `restored: false`, which is the same answer `restore.is_none()` gave them. * fix(remote): check the server instance against the record, not just memory A remote workspace's pane ids were only guarded against server restarts by `RemoteLinks::instances`, an in-memory map. On the first connect after the client starts, every machine is a first sighting, so `server_restarted` answers false — and a `tty7-server` that was replaced while the client was closed sails straight through. Its pane ids restart from 1, so the saved ones now name unrelated shells, and the reconnect attaches to them: the exact id-reuse failure the local side already guards against. `Workspace::daemon_instance` was local-only for the stated reason that a remote server's identity is tracked live per connection. That tracking is correct but not sufficient — it cannot survive the client restart that makes the question worth asking. So the field now means the same thing on both sides: which process minted the pane ids in this record. `WorkspaceStore::serving_instance` picks the local daemon or the far machine's server depending on the workspace, and `finish_attempt` compares it per workspace before deciding to re-attach or rebuild. It stays client-owned: it records what *this* client last saw, so two clients on one remote workspace each keep their own and neither may overwrite the other's. An unreachable machine still records nothing, which is what keeps a good stamp from being erased with `None` — that would disarm the next check. Also in these three files: the §N references to the deleted design docs, cleaned up as part of the sweep in the following commit. * docs: drop the references to the deleted design documents The three documents this branch removed were cited ~280 times: `design §10`, `contract §8`, `§17` and friends in comments, five references by file path in code and manifests, five in CI workflows and one in the release skill. Every one of them now points at nothing. Rewritten rather than merely stripped, because most were not decoration: "design §10 makes the remote's `workspaces.json` the authority" becomes a statement in its own right, and the several that carried a Chinese phrase from the document as their justification say the same thing in English instead. Where the reference was purely parenthetical it is simply gone. Not touched: `PRD §7.1`, `brief §8` and the like, which name documents this branch did not remove and were already external before it, and the `RFC 4648 §10` test-vector citation, which is a real specification. The `host boundary` CI job loses `(§10.6)` from its name. It is not one of the required checks, so branch protection is unaffected. --------- Co-authored-by: l0ng-ai <24760907+l0ng-ai@users.noreply.github.com>