Add attach/detach glue calls to calendar and market CRUD

Wire up ContainerRelation tracking via attach_child/detach_child in:
- calendars: create (including revive), soft_delete
- markets: create (including revive), soft_delete

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bp/markets/services/markets.py

@@ -9,6 +9,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from market.models.market_place import MarketPlace
 from blog.models.ghost_content import Post
 from shared.browser.app.utils import utcnow
+from glue.services.relationships import attach_child, detach_child
 
 
 class MarketError(ValueError):
@@ -55,12 +56,14 @@ async def create_market(sess: AsyncSession, post_id: int, name: str) -> MarketPl
             existing.deleted_at = None
             existing.name = name
             await sess.flush()
+            await attach_child(sess, "page", post_id, "market", existing.id)
             return existing
         raise MarketError(f'Market with slug "{slug}" already exists for this page.')
 
     market = MarketPlace(container_type="page", container_id=post_id, name=name, slug=slug)
     sess.add(market)
     await sess.flush()
+    await attach_child(sess, "page", post_id, "market", market.id)
     return market
 
 
@@ -83,4 +86,5 @@ async def soft_delete(sess: AsyncSession, post_slug: str, market_slug: str) -> b
 
     market.deleted_at = utcnow()
     await sess.flush()
+    await detach_child(sess, "page", market.container_id, "market", market.id)
     return True