Build the current workspace snapshot on native CI runners

This branch snapshots the in-progress desktop workspace so GitHub-hosted Windows and Linux runners can package the same source tree that already passes local verification on macOS.

Constraint: Local Apple Silicon Docker/Wine packaging crashes before Windows artifacts are produced
Rejected: Publish from the incomplete base repo state | remote typecheck failed because current source additions were missing
Confidence: medium
Scope-risk: broad
Directive: Treat this branch as a build snapshot only; do not merge it without reviewing the unrelated workspace changes it contains
Tested: local typecheck, lint, workspace typecheck, unit tests, integration tests, e2e smoke, macOS signed release upload
Not-tested: Native Windows/Linux artifacts before this CI run

src/main/ipc-core-handlers.ts

@@ -3,10 +3,12 @@ import { registerCoreAdminHandlers } from "./ipc-core-admin-handlers";
 import { registerCoreOperationHandlers } from "./ipc-core-operations-handlers";
 import { registerCoreReadHandlers } from "./ipc-core-read-handlers";
 import { registerCoreWorkGraphHandlers } from "./ipc-core-work-graph-handlers";
+import { registerThreadHandlers } from "./ipc-thread-handlers";
 
 export function registerCoreHandlers(dependencies: RegisterCoreHandlersDependencies) {
   registerCoreReadHandlers(dependencies);
   registerCoreAdminHandlers(dependencies);
   registerCoreWorkGraphHandlers(dependencies);
   registerCoreOperationHandlers(dependencies);
+  registerThreadHandlers(dependencies);
 }