fix: keep replicated document application active

Why:
- Large downloaded batches can outlive the finite remote operation and be suspended before every document reaches the Vault.
- The v1.0 activity contract requires local application to remain distinct from remote-operation reporting.

Changes:
- Add an Obsidian-owned local application activity boundary which reuses Wake Lock policy without incrementing remote activity.
- Retain one boundary through queue processing and the final recovery snapshot, releasing and reacquiring it around suspension.
- Log final snapshot failures, preserve processing results, and cover the lifecycle with focused tests and documentation.

src/modules/services/ObsidianServices.unit.spec.ts

@@ -0,0 +1,35 @@
+import { promiseWithResolvers } from "octagonal-wheels/promises";
+import { describe, expect, it, vi } from "vitest";
+import { ObsidianReplicatorService } from "./ObsidianServices";
+
+function handler() {
+    return { addHandler: vi.fn() };
+}
+
+describe("ObsidianReplicatorService", () => {
+    it("tracks local application activity without extending remote activity", async () => {
+        const activity = promiseWithResolvers<void>();
+        const service = new ObsidianReplicatorService({ events: {}, translate: String } as never, {
+            settingService: { onRealiseSetting: handler() },
+            appLifecycleService: { onSuspending: handler(), getUnresolvedMessages: handler() },
+            databaseEventService: {
+                onResetDatabase: handler(),
+                onDatabaseInitialisation: handler(),
+                onDatabaseInitialised: handler(),
+                onDatabaseHasReady: handler(),
+            },
+            activityRunner: { run: vi.fn(async (task: () => Promise<void>) => await task()) },
+        } as never);
+
+        const running = service.runBoundedLocalApplicationActivity(() => activity.promise);
+
+        expect(service.boundedLocalApplicationActivityCount.value).toBe(1);
+        expect(service.boundedRemoteActivityCount.value).toBe(0);
+
+        activity.resolve();
+        await running;
+
+        expect(service.boundedLocalApplicationActivityCount.value).toBe(0);
+        expect(service.boundedRemoteActivityCount.value).toBe(0);
+    });
+});