Fix SCUM companion trajectory storage

plugins/examples/scum-server-plugin/companion/config_test.go

@@ -1,6 +1,10 @@
 package companion
 
-import "testing"
+import (
+	"os"
+	"strings"
+	"testing"
+)
 
 func TestCompanionVehicleHandlerCapabilityIsExplicitAndBounded(t *testing.T) {
 	base := append([]string(nil), requiredCapabilities...)
@@ -14,3 +18,29 @@ func TestCompanionVehicleHandlerCapabilityIsExplicitAndBounded(t *testing.T) {
 		t.Fatal("undeclared raw command handler capability must be rejected")
 	}
 }
+
+func TestLoadConfigDeclaresRawTrajectoryCollection(t *testing.T) {
+	config := loadTestConfig(t)
+	if !config.Trajectory.Enabled || config.Trajectory.Source != TrajectorySourceSCUMSQLite || config.Trajectory.Store != TrajectoryStoreSharedPlatformMySQL {
+		t.Fatalf("trajectory collection is not enabled with plugin-owned source/store: %+v", config.Trajectory)
+	}
+	if config.Trajectory.FileEnv != SCUMDatabaseFileEnvironment || config.Trajectory.IntervalSeconds != DefaultTrajectoryCollectionIntervalSecs || config.Trajectory.MaxRows != DefaultTrajectoryCollectionMaxRows {
+		t.Fatalf("trajectory collection did not use bounded defaults: %+v", config.Trajectory)
+	}
+}
+
+func TestTrajectoryConfigRejectsUnsafeEnvironmentNames(t *testing.T) {
+	fixture := strings.ReplaceAll(string(mustReadConfigFixture(t)), "fileEnv: SCUM_DB_FILE", "fileEnv: PATH")
+	if _, err := LoadConfig(strings.NewReader(fixture)); err == nil || !strings.Contains(err.Error(), "environment") {
+		t.Fatalf("expected reserved env name to be rejected, got %v", err)
+	}
+}
+
+func mustReadConfigFixture(t *testing.T) []byte {
+	t.Helper()
+	payload, err := os.ReadFile("config.yaml.example")
+	if err != nil {
+		t.Fatalf("read config fixture: %v", err)
+	}
+	return payload
+}