Fix native health polling and isolate file operation traffic

tests/unit/watchdog.test.ts

@@ -68,6 +68,41 @@ async function sustainedFailure() {
 }
 
 describe('Watchdog detection and ownership', () => {
+    it('scans files every five minutes while retaining minute health checks and immediate manual scans', async () => {
+        const drift = await import('../../src/lib/server/fleet/drift.js');
+        const scan = vi.spyOn(drift, 'prepareDriftCampaign');
+        await watchdog.watchdogTick();
+        expect(scan).toHaveBeenCalledTimes(1);
+        for (let minute = 1; minute < 5; minute++) {
+            advance(watchdog.WATCHDOG_SCAN_MS);
+            await watchdog.watchdogTick();
+        }
+        expect(scan).toHaveBeenCalledTimes(1);
+        expect(komodo.komodoInspectHealthy).toHaveBeenCalledTimes(5);
+        advance(watchdog.WATCHDOG_SCAN_MS);
+        await watchdog.watchdogTick();
+        expect(scan).toHaveBeenCalledTimes(2);
+        await watchdog.watchdogTick(true);
+        expect(scan).toHaveBeenCalledTimes(3);
+        advance(watchdog.WATCHDOG_SCAN_MS);
+        database.db().prepare('UPDATE servers SET created_at=? WHERE name=?').run(new Date().toISOString(), server);
+        await watchdog.watchdogTick();
+        expect(scan).toHaveBeenCalledTimes(4);
+        scan.mockRestore();
+    });
+
+    it('retries failed file scans on the next health scan instead of retaining successful freshness', async () => {
+        const drift = await import('../../src/lib/server/fleet/drift.js');
+        const scan = vi.spyOn(drift, 'prepareDriftCampaign').mockRejectedValueOnce(new Error('Agent unavailable'));
+        await watchdog.watchdogTick();
+        expect(watchdog.watchdogOverview().scanError).toContain('Agent unavailable');
+        advance(watchdog.WATCHDOG_SCAN_MS);
+        await watchdog.watchdogTick();
+        expect(scan).toHaveBeenCalledTimes(2);
+        expect(watchdog.watchdogOverview().scanError).toBeNull();
+        scan.mockRestore();
+    });
+
     it('defaults to automatic recovery and debounces manual scans without accelerating the failure window', async () => {
         expect(watchdog.watchdogOverview().enabled).toBe(true);
         down();