fix: increase Windows filesystem delays in flaky tests

- TestDaemonAutoImportAfterGitPull: 200ms -> 500ms for filesystem timestamp precision
- TestSyncBranchPull_Success: 100ms -> 300ms for file I/O settling
- Also increase Linux delays slightly for more reliability

cmd/bd/daemon_sync_branch_test.go

@@ -563,9 +563,10 @@ func TestSyncBranchPull_Success(t *testing.T) {
 		t.Error("JSONL not copied to main repo after pull")
 	}
 
-	// On Windows, file I/O may need time to settle
+	// On Windows, file I/O may need more time to settle
+	// Increase delay significantly for reliable CI tests
 	if runtime.GOOS == "windows" {
-		time.Sleep(100 * time.Millisecond)
+		time.Sleep(300 * time.Millisecond)
 	}
 
 	// Verify JSONL content matches