fix(tool-edit-file): wrap getService in try/catch to prevent activation crash

The per-edit diagnostics change (8f6114b) called host.getService(lspServiceHandle)
during activate(). But getService THROWS when a service has no provider — so if
the LSP extension activates AFTER tool-edit-file (or isn't loaded at all), the
activate() function crashes and the edit_file tool is NEVER REGISTERED. This is
why the edit_file tool was missing from the agent toolset.

Fix: wrap getService in try/catch — if the LSP service isn't available yet,
lspService becomes undefined and edits proceed without diagnostics (the graceful
degradation the comment always promised but the code didn't deliver).

1 files changed, 11 insertions, 5 deletions

diff --git a/packages/tool-edit-file/src/extension.ts b/packages/tool-edit-file/src/extension.ts
index bbd8256..9be53da 100644
--- a/packages/tool-edit-file/src/extension.ts
+++ b/packages/tool-edit-file/src/extension.ts
@@ -1,5 +1,5 @@
 import type { Extension } from "@dispatch/kernel";
-import { lspServiceHandle } from "@dispatch/lsp";
+import { type LspService, lspServiceHandle } from "@dispatch/lsp";
 import { createEditFileTool, type DiagnosticsHook } from "./edit-file.js";
 
 export const extension: Extension = {
@@ -14,10 +14,16 @@ export const extension: Extension = {
 		contributes: { tools: ["edit_file"] },
 	},
 	activate(host) {
-		// Optional LSP integration: if the lsp extension is loaded, wire its
-		// getDiagnostics service as the post-edit diagnostics hook. If absent,
-		// edits proceed without diagnostics (graceful degradation).
-		const lspService = host.getService(lspServiceHandle);
+		// Optional LSP integration: if the lsp extension is loaded AND has
+		// activated before us, wire its getDiagnostics service as the post-edit
+		// diagnostics hook. If absent (not loaded, or activates after us), edits
+		// proceed without diagnostics (graceful degradation).
+		let lspService: LspService | undefined;
+		try {
+			lspService = host.getService(lspServiceHandle);
+		} catch {
+			lspService = undefined;
+		}
 		const diagnostics: DiagnosticsHook | undefined = lspService
 			? async (opts) =>
 					lspService.getDiagnostics({