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/app.rs

@@ -73,6 +73,8 @@ pub struct App {
     pub lsp: crate::lsp::Lsp,
     /// Web Push (VAPID key, window visibility per user).
     pub push: crate::push::Push,
+    /// Web terminals (PTYs).
+    pub terminals: crate::terminal::Terminals,
 }
 
 /// What a user may do with a session.
@@ -111,6 +113,7 @@ impl App {
             shells: Mutex::default(),
             lsp: Default::default(),
             push: crate::push::Push::new(&data),
+            terminals: Default::default(),
         });
         crate::auth::bootstrap(&app)?;
         app.clone().start_mcp();