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/run/ChatFilePreview.tsx

@@ -9,7 +9,8 @@
  * `~/.claude` (a memory file, a plugin's skill) through `GET /api/cc-config/file`,
  * an attached image or text file through `GET /api/run/drop/:name`, an image
  * the session read anywhere else through `GET /api/sessions/:id/image`, and a
- * text file it read or wrote anywhere else through `GET /api/sessions/:id/file`.
+ * text file it read, wrote or named (a generated report) anywhere else through
+ * `GET /api/sessions/:id/file`.
  * Anything else (or a file those routes refuse) shows its path only. A Windows path's `\` counts as `/` throughout.
  * `SkillListModal` is the same dialog over the session's skills, each one's
  * SKILL.md found by name (`plugin:name` from the plugin list, else the user's