feat(lsp): implement auto-provisioning for language servers

- Added LSP auto-provisioning functionality to automatically install and connect language servers.
- Introduced `shutdown_lsp` method to cleanly shut down LSP servers on application exit.
- Enhanced `AppStateRest` to spawn a background thread for provisioning language servers.
- Updated `builtin_agents` to include new LSP-related agents.
- Modified settings to include options for LSP auto-provisioning and supported languages.
- Updated file editing and writing tools to notify LSP servers of changes.
- Enhanced LSP tools to support auto-detection of servers based on file extensions.
- Added utility functions for managing known file extensions and resolving server names.
- Created a new `provisioner` module to handle the provisioning logic for various language servers.

src/tool/fs/write.rs

@@ -64,10 +64,21 @@ impl Tool for Write {
         }
         fs::write(&path, &content)
             .map_err(|e| anyhow!("failed to write '{}': {}", rel, e))?;
-        if check_matches.is_empty() {
-            Ok(format!("wrote {} bytes to {}", content.len(), rel))
+        // Notify the LSP server of the on-disk change so diagnostics stay in
+        // sync. Never fails the write itself: a lock failure or LSP error is
+        // folded into the returned message instead of propagated as an Err.
+        let lsp_note = if let Ok(mut lsp) = ctx.lsp_manager.lock() {
+            match lsp.did_change_file(&path) {
+                Ok(()) => String::new(),
+                Err(e) => format!(" (LSP: {})", e),
+            }
         } else {
-            Ok(format!("wrote {} bytes to {}. Graduated checks matched: {}", content.len(), rel, check_matches.join(", ")))
+            String::new()
+        };
+        if check_matches.is_empty() {
+            Ok(format!("wrote {} bytes to {}{}", content.len(), rel, lsp_note))
+        } else {
+            Ok(format!("wrote {} bytes to {}{}. Graduated checks matched: {}", content.len(), rel, lsp_note, check_matches.join(", ")))
         }
     }
 }