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/Sagi/SagiPanel.tsx

@@ -60,7 +60,6 @@ import {
   Radio,
   Heart,
   ChevronRight,
-  MessageCircle,
   type LucideIcon,
 } from "lucide-react";
 import { useTranslation } from "react-i18next";
@@ -89,8 +88,6 @@ interface SagiPanelProps {
   onNavigate: (route: string) => void;
   /** Returns an answer to display, or null when the query was handed off. */
   onAsk: (query: string) => string | null;
-  /** Opens the chat window (PetChat). */
-  onOpenChat: () => void;
   onClose: () => void;
 }
 
@@ -108,7 +105,6 @@ export function SagiPanel({
   onClearAlerts,
   onNavigate,
   onAsk,
-  onOpenChat,
   onClose,
 }: SagiPanelProps) {
   const { t } = useTranslation("settings");
@@ -282,13 +278,6 @@ export function SagiPanel({
 
         {/* quick actions */}
         <div className="mb-3 grid grid-cols-2 gap-1.5">
-          <div className="col-span-2">
-            <ActionButton
-              icon={MessageCircle}
-              label={t("sagi.panel.chat", { name })}
-              onClick={onOpenChat}
-            />
-          </div>
           <ActionButton
             icon={muted ? BellOff : Bell}
             label={muted ? t("sagi.panel.unmute") : t("sagi.panel.mute")}