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.

client/src/components/lanes/WorkspaceHome.tsx

@@ -1,7 +1,7 @@
 /**
  * @file WorkspaceHome — what `/workspace?lane=<id>` opens on, shaped like a
  * Claude Desktop project page: the name, a prompt box that starts a NEW
- * session in the first free pane slot (0–3, `POST /api/lanes/:id/start`) and
+ * session in the first free slot (0–9, `POST /api/lanes/:id/start`) and
  * then opens it (`&run=<runId>`) — the one place a session starts WITH a
  * prompt (the session view's tab bar `+` only starts a bare CLI or a shell,
  * `ConsoleTabs.tsx`). Inside
@@ -82,6 +82,7 @@ export {
   startInFreeTabDetailed,
 } from "./startSession";
 import { startInFreeTab } from "./startSession";
+import { PathPickButton } from "../PathPickButton";
 
 function fmtBytes(n: number | null): string {
   if (!n) return "";
@@ -110,9 +111,8 @@ function HomeBody({
   onRenamed,
 }: {
   lane: Lane;
-  /** Row-menu items the page carries out (its modals); rename is done here.
-   *  `started` comes with the run it opened. */
-  onMenuAction: (action: WorkspaceMenuAction, runId?: string) => void;
+  /** Row-menu items the page carries out (its modals); rename is done here. */
+  onMenuAction: (action: WorkspaceMenuAction) => void;
   /** Called after a rename, so the page re-reads the lane list. */
   onRenamed?: () => void;
 }) {
@@ -957,6 +957,7 @@ function HomeBody({
                   onChange={(e) => setFolderPath(e.target.value)}
                   className="min-w-0 flex-1 rounded border border-border bg-surface-1 px-2 py-1 font-mono text-[11px] text-fg-primary"
                 />
+                <PathPickButton start={folderPath || lane.cwd} onPick={setFolderPath} />
                 <button type="submit" disabled={!folderPath.trim()} className="btn-ghost text-xs">
                   {t("home.add")}
                 </button>
@@ -1016,10 +1017,10 @@ function HomeBody({
             <div
               role="tablist"
               aria-label={t("home.memory")}
-              // shrink-0: a horizontal scroller's min-height is 0, so in this
-              // height-capped column a long file squeezed the row and clipped
-              // the tabs. The panel below is the one part that scrolls.
-              className="mb-3 flex shrink-0 gap-1.5 overflow-x-auto border-b border-border/60 pb-2 no-scrollbar"
+              // Wraps, so every file is reachable without a horizontal wheel (a
+              // hidden-scrollbar row cut the rest off); past ~3 rows it scrolls
+              // with a visible bar. shrink-0: a long file must not squeeze it.
+              className="mb-3 flex max-h-28 shrink-0 flex-wrap gap-1.5 overflow-y-auto border-b border-border/60 pb-2"
             >
               {memory.map((f, i) => (
                 <button
@@ -1124,9 +1125,7 @@ function HomeBody({
           x={menuAt.x}
           y={menuAt.y}
           onClose={() => setMenuAt(null)}
-          onAction={(a, runId) =>
-            a === "rename" ? setTitle(lane.title || "") : onMenuAction(a, runId)
-          }
+          onAction={(a) => (a === "rename" ? setTitle(lane.title || "") : onMenuAction(a))}
         />
       )}
     </div>