feat: workspace aliases, tab groups of split panes, native path picker (v2.1.0)

- /api/workspaces and `agenthub workspace(s)` / `--workspace` as aliases of
  /api/lanes and `agenthub lanes` / `--lane`; old names print one stderr note.
  REPL `help lanes|workspace|workspaces` resolves through the aliases.
- A workspace holds up to ten sessions (slots 0-9); every console tab is a
  group of 1-4 split panes (PaneGroups, agenthub.workspace.paneLayout);
  parseGroups keeps the stored active tab when an earlier one is dropped.
- Browse button beside path fields: POST /api/lanes/pick-path opens the OS
  picker on the server's desktop — loopback only and no forwarding header
  (EREMOTE), a display failure is ENODIALOG not a Cancel, the dialog is
  killed when the request closes, a folder field falls back to the in-app
  browser on any failure.
- Changes rail counts chip, image viewer (/git/raw), status bar session
  counts and per-day cost (`date=` on /api/pricing/cost).
- /agenthub-open and /agenthub-doctor run from the INSTALLED build
  (supersededBy), doctor offers fixes behind two confirmations; plugin-open
  treats a locked bootstrap as non-fatal.
- New-terminal shell waits for the first attach (issue #55).
- repo-onboarding / debug-live-issue skills removed.
- OpenAPI: pick-path, lane/date on /pricing/cost, tool on /run/history,
  /api/workspaces mount.

server/routes/run.js

@@ -84,7 +84,8 @@ router.get("/", (_req, res) => {
  *
  * Optional ?limit=<n> caps results (default 50, max 500). The most recent
  * runs are first. Optional ?laneId=<n> narrows to the runs started through one
- * lane, which is what the Workspace page's per-lane history shows.
+ * lane, and ?tool=<id> (with a laneId) to one tool's — the sidebar reads a
+ * workspace's closed Terminal tabs with `tool=shell`.
  */
 // ── Drag & drop into the terminal ─────────────────────────────────────────
 // A local terminal answers a dropped image by typing its PATH, which is how
@@ -149,6 +150,7 @@ router.get("/history", (req, res) => {
   const items = dr.listRuns({
     limit: Number.isFinite(limit) ? limit : 50,
     laneId: Number.isFinite(laneId) ? laneId : null,
+    tool: typeof req.query.tool === "string" ? req.query.tool : null,
   });
   const liveIds = new Set(runs.listRuns().map((h) => h.id));
   res.json({