refactor: update module docstrings for clarity and consistency

backend/app/models/organization_board_access.py

@@ -1,6 +1,8 @@
+"""Board-level access grants assigned to organization members."""
+
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime  # noqa: TCH003
 from uuid import UUID, uuid4
 
 from sqlalchemy import UniqueConstraint
@@ -11,6 +13,8 @@ from app.models.base import QueryModel
 
 
 class OrganizationBoardAccess(QueryModel, table=True):
+    """Member-specific board permissions within an organization."""
+
     __tablename__ = "organization_board_access"
     __table_args__ = (
         UniqueConstraint(
@@ -21,7 +25,10 @@ class OrganizationBoardAccess(QueryModel, table=True):
     )
 
     id: UUID = Field(default_factory=uuid4, primary_key=True)
-    organization_member_id: UUID = Field(foreign_key="organization_members.id", index=True)
+    organization_member_id: UUID = Field(
+        foreign_key="organization_members.id",
+        index=True,
+    )
     board_id: UUID = Field(foreign_key="boards.id", index=True)
     can_read: bool = Field(default=True)
     can_write: bool = Field(default=False)