feat: add native Windows hierarchy test harness

internal/client/spool/spool_test.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"crypto/sha256"
 	"errors"
+	"net/url"
 	"os"
 	"path/filepath"
 	"testing"
@@ -16,6 +17,13 @@ import (
 	"google.golang.org/protobuf/proto"
 )
 
+func TestSQLiteFileURIWindowsDrivePath(t *testing.T) {
+	query := url.Values{"_pragma": {"journal_mode(WAL)"}}
+	if got, want := sqliteFileURI(`C:\ProgramData\RVBox\test-state\spool.db`, query), "file:///C:/ProgramData/RVBox/test-state/spool.db?_pragma=journal_mode%28WAL%29"; got != want {
+		t.Fatalf("sqliteFileURI() = %q, want %q", got, want)
+	}
+}
+
 func TestExecutionSpecIsDurableAndQuotaCounted_HP_DISPATCH_07(t *testing.T) {
 	t.Parallel()
 	ctx := context.Background()