Add web terminal, git credentials, OpenSCAD, review loops, automations

- Web terminal (PTY over WebSocket, xterm.js, sandboxed, reattach with replay)
- Per-user git credentials and commit identity (credential store in the user's home)
- OpenSCAD tool (STL/3MF + preview renders, bounding box) and cad skill; 3D model card
- Craft phase inferred from tool activity when the agent does not report it
- Configurable review loop per mode (rounds, reviewer model, criteria)
- Delete config and Markdown agents from the agent editor
- Automations: cron-scheduled agents from Markdown job files, schedule tool, page
- change_directory tool (only on the user's request)

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

web/src/components/Icon.tsx

@@ -12,6 +12,7 @@ const P: Record<string, ReactNode> = {
   "arrow-up": <path d="M12 19V5M6 11l6-6 6 6" />,
   "arrow-down": <path d="M12 5v14M6 13l6 6 6-6" />,
   "arrow-left": <path d="M19 12H5M11 6l-6 6 6 6" />,
+  "arrow-right": <path d="M5 12h14M13 6l6 6-6 6" />,
   "chevron-right": <path d="m9 6 6 6-6 6" />,
   "chevron-down": <path d="m6 9 6 6 6-6" />,
   share: (
@@ -192,6 +193,12 @@ const P: Record<string, ReactNode> = {
   ),
   dot: <circle cx="12" cy="12" r="4.5" className="fill" />,
   plus: <path d="M12 5v14M5 12h14" />,
+  clock: (
+    <>
+      <circle cx="12" cy="12" r="8.5" />
+      <path d="M12 7.5V12l3 2" />
+    </>
+  ),
   minus: <path d="M5 12h14" />,
   upload: <path d="M12 16V4M7 9l5-5 5 5M4 16v3a1 1 0 0 0 1 1h14a1 1 0 0 0 1-1v-3" />,
   more: (