Add State Hub RecentlyOnScope invocation

src/activity_core/activities.py

@@ -102,7 +102,8 @@ async def resolve_context(
     Returns: {bind_key: resolved_value, ...}
 
     Source types are dispatched via CONTEXT_RESOLVER_REGISTRY.
-    A resolver that raises logs a warning and binds {} — it does not abort the run.
+    A resolver that raises logs a warning and binds {} unless the context source
+    is marked required, in which case the activity fails visibly.
     The 'static' type is handled inline without a registry entry.
     """
     import activity_core.context_resolvers  # noqa: F401 — registers all adapters
@@ -113,6 +114,7 @@ async def resolve_context(
         source_type = source.get("type", "")
         query = source.get("query", "")
         params = source.get("params") or {}
+        required = bool(source.get("required") or params.get("required", False))
         raw_bind = source.get("bind_to") or source.get("name") or source_type
         # Strip the 'context.' namespace prefix so evaluator can find the key.
         bind_key = raw_bind.removeprefix("context.") if raw_bind.startswith("context.") else raw_bind
@@ -123,6 +125,11 @@ async def resolve_context(
 
         resolver_cls = CONTEXT_RESOLVER_REGISTRY.get(source_type)
         if resolver_cls is None:
+            if required:
+                raise ApplicationError(
+                    f"Required context source type {source_type!r} is not registered",
+                    non_retryable=True,
+                )
             activity.logger.warning(
                 "Unknown context source type %r — binding {}",
                 source_type,
@@ -133,6 +140,10 @@ async def resolve_context(
         try:
             snapshot[bind_key] = resolver_cls().resolve(query, None, params)
         except Exception as exc:
+            if required:
+                raise ApplicationError(
+                    f"Required context resolver {source_type!r}/{query!r} failed: {exc}"
+                ) from exc
             activity.logger.warning(
                 "Context resolver %r failed — %s; binding {}",
                 source_type,