refactor(codex): name progress delta capability semantically

Use a provider capability name that describes user-visible progress delta support instead of the runner implementation detail.

Made-with: Cursor

nanobot/agent/runner.py

@@ -612,7 +612,7 @@ class AgentRunner:
         wants_progress_streaming = (
             not wants_streaming
             and spec.progress_callback is not None
-            and getattr(self.provider, "stream_progress_via_chat_stream", False) is True
+            and getattr(self.provider, "supports_progress_deltas", False) is True
         )
 
         if wants_streaming:

nanobot/providers/base.py

@@ -91,7 +91,7 @@ _SYNTHETIC_USER_CONTENT = "(conversation continued)"
 class LLMProvider(ABC):
     """Base class for LLM providers."""
 
-    stream_progress_via_chat_stream = False
+    supports_progress_deltas = False
 
     _CHAT_RETRY_DELAYS = (1, 2, 4)
     _PERSISTENT_MAX_DELAY = 60

nanobot/providers/openai_codex_provider.py

@@ -26,7 +26,7 @@ DEFAULT_ORIGINATOR = "nanobot"
 class OpenAICodexProvider(LLMProvider):
     """Use Codex OAuth to call the Responses API."""
 
-    stream_progress_via_chat_stream = True
+    supports_progress_deltas = True
 
     def __init__(self, default_model: str = "openai-codex/gpt-5.1-codex"):
         super().__init__(api_key=None, api_base=None)