merge: chore/cleanup-remove-bloat-and-secrets into main

app/domain/labels/sources/__init__.py

@@ -0,0 +1,16 @@
+"""Source adapters for the federated label API.
+
+Each adapter implements `query(address, chain) -> list[Label]`.
+
+To add a new source:
+  1. Create a new module in this package (e.g., `my_source.py`)
+  2. Implement `async def query_my_source(address: str, chain: str) -> list[Label]`
+  3. Register it in LabelSource enum (models.py)
+  4. Wire it in federated.py:_query_source dispatcher
+
+All adapters follow these conventions:
+  - Return [] on no match (not None)
+  - Raise exceptions on infrastructure errors (handled by caller)
+  - All addresses are normalized to lowercase before query
+  - Each label has source=LabelSource.MY_SOURCE
+"""