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/src/tools/mod.rs

@@ -4,6 +4,7 @@
 pub mod agent;
 pub mod bash;
 pub mod craft;
+pub mod cad;
 pub mod fs;
 pub mod web;
 
@@ -160,6 +161,9 @@ pub fn builtin_tools() -> Vec<Arc<dyn Tool>> {
         Arc::new(web::WebFetch),
         Arc::new(web::WebSearch),
         Arc::new(agent::CraftPhase),
+        Arc::new(agent::ChangeDirectory),
+        Arc::new(cad::OpenScad),
+        Arc::new(crate::jobs::Schedule),
         Arc::new(crate::lsp::Diagnostics),
         Arc::new(agent::TodoWrite),
         Arc::new(agent::AskUser),