feat: add exporter plugin architecture

scripts/exporter/base_exporter.py

@@ -0,0 +1,27 @@
+"""Abstract base class for platform exporters."""
+
+from __future__ import annotations
+
+from abc import ABC, abstractmethod
+
+
+class BaseExporter(ABC):
+    """Base class for exporting truth data to native platform formats."""
+
+    @staticmethod
+    @abstractmethod
+    def platform_name() -> str:
+        """Return the platform identifier this exporter targets."""
+
+    @abstractmethod
+    def export(
+        self,
+        truth_data: dict,
+        output_path: str,
+        scraped_data: dict | None = None,
+    ) -> None:
+        """Export truth data to the native platform format."""
+
+    @abstractmethod
+    def validate(self, truth_data: dict, output_path: str) -> list[str]:
+        """Validate exported file against truth data, return list of issues."""