chore(core): 对齐 stale-lock 测试注释 (#1883)

统一两条时间戳测试注释的空格对齐，保持新增测试文件通过 gofmt。\n\nverify: go test ./core -run TestStaleLockDumpNamePadding\|TestPruneStaleLockDumps\|TestPruneStaleLockDumpsNoOps\|TestDumpStaleLockStacksEndToEnd\|TestSession_TryLockUnlock\|TestSession_Busy\$\|TestSession_LateUnlockDropped\|TestSession_BreakStaleLockThreshold\|TestSession_ForceUnlock -count=1 (ok); go vet ./core ./cmd/... ./agent/claudecode (ok); git diff --check (ok)

core/engine_staledump_test.go

@@ -12,8 +12,8 @@ import (
 // digits, so lexicographic order is chronological even across the 9→10→11
 // digit boundaries. A regression to bare %d breaks both assertions below.
 func TestStaleLockDumpNamePadding(t *testing.T) {
-	older := staleLockDumpName(999999999, "sessA")   // 9-digit ts
-	newer := staleLockDumpName(1000000000, "sessB")  // 10-digit ts
+	older := staleLockDumpName(999999999, "sessA")  // 9-digit ts
+	newer := staleLockDumpName(1000000000, "sessB") // 10-digit ts
 	wantOlder := "busy-stale-0000999999999-sessA.txt"
 	if older != wantOlder {
 		t.Fatalf("got %q, want %q", older, wantOlder)