fix: Add context.Background() to sqlite.New() calls in test files

Multiple test files were still using the old sqlite.New(path) signature
instead of the new sqlite.New(ctx, path) signature. This was causing
compilation failures in the test suite.

Fixed files:
- internal/importer/importer_test.go
- internal/importer/external_ref_test.go
- internal/importer/timestamp_test.go
- internal/rpc/limits_test.go
- internal/rpc/list_filters_test.go
- internal/rpc/rpc_test.go
- internal/rpc/status_test.go
- internal/syncbranch/syncbranch_test.go

internal/rpc/limits_test.go

@@ -30,7 +30,7 @@ func TestConnectionLimits(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	store, err := sqlite.New(dbPath)
+	store, err := sqlite.New(context.Background(), dbPath)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -152,7 +152,7 @@ func TestRequestTimeout(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	store, err := sqlite.New(dbPath)
+	store, err := sqlite.New(context.Background(), dbPath)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -208,7 +208,7 @@ func TestHealthResponseIncludesLimits(t *testing.T) {
 	dbPath := filepath.Join(tmpDir, "test.db")
 	socketPath := filepath.Join(tmpDir, "test.sock")
 
-	store, err := sqlite.New(dbPath)
+	store, err := sqlite.New(context.Background(), dbPath)
 	if err != nil {
 		t.Fatal(err)
 	}

internal/rpc/list_filters_test.go

@@ -31,7 +31,7 @@ func setupTestServerWithStore(t *testing.T) (*Server, *Client, *sqlitestorage.SQ
 
 	os.Remove(socketPath)
 
-	store, err := sqlitestorage.New(dbPath)
+	store, err := sqlitestorage.New(context.Background(), dbPath)
 	if err != nil {
 		os.RemoveAll(tmpDir)
 		t.Fatalf("Failed to create store: %v", err)

internal/rpc/rpc_test.go

@@ -37,7 +37,7 @@ func setupTestServer(t *testing.T) (*Server, *Client, func()) {
 	// Ensure socket doesn't exist from previous failed test
 	os.Remove(socketPath)
 
-	store, err := sqlitestorage.New(dbPath)
+	store, err := sqlitestorage.New(context.Background(), dbPath)
 	if err != nil {
 		os.RemoveAll(tmpDir)
 		t.Fatalf("Failed to create store: %v", err)
@@ -354,7 +354,7 @@ func TestSocketCleanup(t *testing.T) {
 	dbPath := filepath.Join(tmpDir, "test.db")
 	socketPath := filepath.Join(tmpDir, "bd.sock")
 
-	store, err := sqlitestorage.New(dbPath)
+	store, err := sqlitestorage.New(context.Background(), dbPath)
 	if err != nil {
 		t.Fatalf("Failed to create store: %v", err)
 	}

internal/rpc/status_test.go

@@ -15,7 +15,7 @@ func TestStatusEndpoint(t *testing.T) {
 	dbPath := filepath.Join(tmpDir, "test.db")
 	socketPath := filepath.Join(tmpDir, "test.sock")
 
-	store, err := sqlite.New(dbPath)
+	store, err := sqlite.New(context.Background(), dbPath)
 	if err != nil {
 		t.Fatalf("failed to create storage: %v", err)
 	}