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

tests/unit/ipc-batcher.test.ts

@@ -144,7 +144,7 @@ describe("createDomainEventBatcher", () => {
     const batcher = createDomainEventBatcher(onFull, onGranular, 50);
 
     // These events are not recognized as granular -- per D-05, unknown triggers full refresh
-    batcher.push({ type: "run-log", runId: "r-1", stream: "stdout", text: "hi" } as DesktopEvent);
+    batcher.push({ type: "run-log", runId: "r-1", stream: "stdout", chunk: "hi" } as DesktopEvent);
 
     vi.advanceTimersByTime(50);
     expect(onFull).toHaveBeenCalledTimes(1);