fix(actor): align _resolve_actor_name error + annotate cloud validators

The _resolve_actor_name error message did not contain the substrings the
TDD behave scenarios assert against ("Actor name is required" and
"Missing required 'name' field"); update the BadParameter text so both
case-insensitive substring checks match without changing the surrounding
guidance that points users at the YAML 'name' field.

Two field_validator("region") classmethods in cloud_types.py (the GCP
and Azure variants) lacked an annotation on parameter v, tripping the
architecture.feature:38 "Type hints are used throughout" guard for
public functions. Add the narrow ``str | None`` type that matches the
existing -> str | None return type and the value the Pydantic v2
validator actually receives.

ISSUES CLOSED: #11047

src/cleveragents/cli/commands/actor.py

@@ -413,8 +413,9 @@ def _resolve_actor_name(
     raw_name = config_blob.get("name")
     if not raw_name or not isinstance(raw_name, str) or not raw_name.strip():
         raise typer.BadParameter(
-            f"Missing actor name. Provide it either as the positional NAME "
-            f"argument to `agents actor add`, or via a 'name' field inside "
+            f"Actor name is required: missing required 'name' field. "
+            f"Provide it either as the positional NAME argument to "
+            f"`agents actor add`, or via a 'name' field inside "
             f"{config_path} (e.g. ``name: local/my-actor`` at the top of the "
             "YAML / JSON document)."
         )