feat: v2.7.8 — Artifacts hub, clone related repos as extra folders, quieter resume prompt

- Artifacts (/artifacts): claude.ai pages sessions publish (captured from the
  Artifact tool's hook), pinned workspace files, skills and plugins, each
  kept as a snapshot; shared ones appear in a Hub and a skill or plugin
  installs into the viewer's own account (server/lib/artifacts.js,
  /api/artifacts, docs/plans/artifacts/).
- Workspace extra folders: clone one or more related repos beside the
  workspace and add them in one step (POST /api/lanes/:id/sources/clone).
- A pane that ended by itself while tmux kept running is no longer offered
  for resume (tmux.serverStartedAt in reconcileOrphans).
- Changes panel: a folder that is not a git repo opens on Files, and its
  files open from there.
- Plus the parallel sessions' work in this tree: File Explorer button in the
  panel header, user delete, RSA SSH keys, chat/terminal and pet fixes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

client/src/components/AuthGate.tsx

@@ -63,6 +63,10 @@ export function usePermissions() {
   const isAdmin = local || user?.role === "admin";
   return {
     isAdmin,
+    // Local mode: one person on their own machine — what only serves a
+    // shared server (File Explorer, uploads, AgentHub's own git logins) is
+    // hidden; their desktop and their own git config already do it.
+    local,
     seesAll: local || (!!user && user.role !== "developer"),
     // A developer only ever sees their own rows, so everything shown is theirs.
     canEditLane: (lane?: { owner_id?: number | null } | null) =>