Initial commit: Oracle AI research pipeline (adapters, pipeline, summarize, query)

Source-controlled baseline before Phase 5 cron. Excludes oracle.db,
logs/, and __pycache__ via .gitignore. Pipeline verified running
clean end-to-end (run_log write confirmed before conn.close()).

adapters/__init__.py

@@ -0,0 +1,17 @@
+"""Source adapters for AI Research Oracle."""
+
+from abc import ABC, abstractmethod
+
+
+class SourceAdapter(ABC):
+    """Base class for all ingestion adapters."""
+
+    @abstractmethod
+    def name(self) -> str:
+        """Source name: 'github', 'arxiv', 'reddit'."""
+        pass
+
+    @abstractmethod
+    def fetch(self, query: str = "", limit: int = 20) -> list[dict]:
+        """Return entries matching DB schema fields."""
+        pass