Fix pyright type errors across codebase

- Add pyrightconfig.json for pyright 1.1.408 TOML parsing workaround
- Add NoReturn annotations to fatal() functions for proper type narrowing
- Add None checks and assertions after require=True get_record() calls
- Fix AttrDict class with __getattr__ for dynamic attribute access
- Add type annotations and casts for Kubernetes client objects
- Store compose config as DockerDeployer instance attributes
- Filter None values from dotenv and environment mappings
- Use hasattr/getattr patterns for optional container attributes

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

stack_orchestrator/base.py

@@ -23,7 +23,7 @@ def get_stack(config, stack):
     if stack == "package-registry":
         return package_registry_stack(config, stack)
     else:
-        return base_stack(config, stack)
+        return default_stack(config, stack)
 
 
 class base_stack(ABC):
@@ -40,6 +40,16 @@ class base_stack(ABC):
         pass
 
 
+class default_stack(base_stack):
+    """Default stack implementation for stacks without specific handling."""
+
+    def ensure_available(self):
+        return True
+
+    def get_url(self):
+        return None
+
+
 class package_registry_stack(base_stack):
     def ensure_available(self):
         self.url = "<no registry url set>"