fix: writer/reader correctness and determinism issues

- merge: cloneTable keeps relationships; skip-tables applies to new schemas
- diff: detect schema description/owner changes
- prisma: reader no longer turns relation fields into columns, enum
  detection via declared names; writer type mapping is ordered
- typeorm writer: keep explicit SQL types that cannot be inferred
- drizzle: enum columns call the enum constant; reader resolves them
- mysql/mssql/sqlite writers: honour OutputPath, deterministic column
  and constraint order; mssql live execute covers full schema
- template: ToYAML recovers from panics; Merge nil-pointer loop
- regenerate drizzle fixtures

pkg/writers/drizzle/type_mapper.go

@@ -100,8 +100,8 @@ func (tm *TypeMapper) BuildColumnChain(col *models.Column, table *models.Table,
 	// Determine Drizzle column type
 	var drizzleType string
 	if isEnum {
-		// For enum types, use the type name directly
-		drizzleType = fmt.Sprintf("pgEnum('%s')", col.Type)
+		// Enum columns call the enum constant declared via pgEnum(...)
+		drizzleType = tm.ToCamelCase(col.Type)
 	} else {
 		drizzleType = tm.SQLTypeToDrizzle(col.Type)
 	}