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/config/ProjectMemoryModal.tsx

@@ -21,6 +21,7 @@ import { api, type CwdSuggestion } from "../../lib/api";
 import { confirmDiscard } from "../../lib/confirm";
 import { useDialog } from "../../hooks/useDialog";
 import { useUnsavedGuard } from "../../hooks/useUnsavedGuard";
+import { PathPickButton } from "../PathPickButton";
 
 interface ProjectMemoryModalProps {
   /** i18n namespace of the calling page — "ccConfig" or "codexConfig". */
@@ -133,15 +134,18 @@ export function ProjectMemoryModal({
             >
               {t("projectMemory.dirLabel")}
             </label>
-            <input
-              id={`${listId}-dir`}
-              list={listId}
-              value={dir}
-              onChange={(e) => setDir(e.target.value)}
-              placeholder="/home/you/projects/my-app"
-              spellCheck={false}
-              className="w-full bg-surface-2 border border-border rounded-md px-3 py-1.5 text-sm font-mono text-fg-primary placeholder:text-fg-muted focus:outline-none focus:border-accent/50"
-            />
+            <div className="flex gap-1.5">
+              <input
+                id={`${listId}-dir`}
+                list={listId}
+                value={dir}
+                onChange={(e) => setDir(e.target.value)}
+                placeholder="/home/you/projects/my-app"
+                spellCheck={false}
+                className="w-full bg-surface-2 border border-border rounded-md px-3 py-1.5 text-sm font-mono text-fg-primary placeholder:text-fg-muted focus:outline-none focus:border-accent/50"
+              />
+              <PathPickButton start={dir} onPick={setDir} />
+            </div>
             <datalist id={listId}>
               {suggestions.map((s) => (
                 <option key={s.path} value={s.path}>