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>

server/resources/commands/cad.md

@@ -0,0 +1,9 @@
+---
+description: Design a 3D-printable part with OpenSCAD (from a description or an attached sketch)
+---
+Load the skill "cad" with the skill tool and design the part described below as a parametric
+OpenSCAD model in the current working directory. If a sketch or photo is attached, start by
+describing it and its dimensions. Render it with the openscad tool, check the previews and the
+bounding box, refine, and finish with STL and 3MF exports and a short summary.
+
+Part: $ARGUMENTS