feat(x): folders as workspaces — linked folders, list view, live workspace chats

[arkml]

What

Three changes to the Workspaces section, verified end-to-end by driving the app with Playwright:

1. Any folder can be added as a workspace (4c461259)

• Linked folders: "Add workspace" now offers New workspace (existing behavior) or Add existing folder… — pick any folder on disk and browse/edit it in Rowboat. Nothing is copied or symlinked; a registry at config/workspace-folders.json records {id, name, path}.
• New @folder/<id>/… path space in resolveWorkspacePath/absToRelPosix, containment-checked against the linked root — every existing workspace:* IPC (readdir/read/write/rename/remove/reveal) works on linked folders unchanged.
• Deletes inside a linked folder go to the OS trash (main registers shell.trashItem into core) — WorkDir/.trash would fail cross-volume and leak files into Rowboat's workdir.
• Deliberately not watched by chokidar (a linked repo's node_modules would EMFILE — see watcher.ts); the view refreshes on navigation/focus + manual Refresh. Linked folders also stay out of the knowledge index/graph, wiki links, and version history by construction.
• Rename edits the Rowboat label only; "Remove from Rowboat" unlinks without touching disk.

2. Workspace browsing is a list view (408c084b)

• Both the workspaces root and folder contents render as a list: Name · Location/Kind · Last updated (6h ago, Yesterday, Jul 20; exact timestamp on hover).
• Column headers sort (name A→Z, time newest-first on first click), choice persisted in localStorage. Folders group first only when sorting by name.
• A workspace's time is the newest mtime anywhere inside it (deep walk of the already-loaded tree); linked roots show their own mtime since their contents load lazily.

3. Workspace chats work again, and live (ab78c975)

• Fix: runs:listByWorkDir still scanned legacy runs/*.jsonl, which the boot migration moves to runs-archive/ — so the Chats panel was always empty. It now filters the in-memory session index against the config/workdir-<id>.json sidecars (new runtime/sessions/by-workdir.ts); dead legacy implementation removed.
• Sessions the index failed to load (empty timestamps) are filtered out — one corrupt session would previously fail schema validation for the whole response and blank the panel.
• The panel updates live: debounced refetch on sessions:events (create/retitle/delete) and on a new WORKSPACE_CHATS_CHANGED renderer event fired when a chat's work directory is set — covering the no-navigation case where the workspace is open in the middle pane while the chat sits in the right pane.

Verification

Driven in the real app (isolated ROWBOAT_WORKDIR, real session fixtures): add/browse/edit/rename/delete in linked folders incl. path-traversal + boundary rejections; sort flips and persistence; chats panel populated from a real migrated session, nested-dir matching, live appearance of new/retitled/moved-in chats. npm run typecheck clean; lint unchanged from main (same 11 pre-existing errors).

Known follow-ups

• Chats panel could open by default when entering a workspace.
• Recent-work-dir picker shows only folder basenames — picking a same-named folder from another Rowboat workdir is indistinguishable (bit us once already).
• Pre-existing: rename input doesn't take keyboard focus from the context menu (present before this branch).
• The larger chat-first workspace redesign (default workspace, switcher, per-tab binding) is specced separately and builds on this.

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