fix(agent): call _format_base_models via self. to prevent NameError

The bare call  inside _build_prompt_context
would raise NameError because class methods don't close over class-level
scope. Use  instead to trigger attribute lookup.

Update enrich_hf_metadata prompt.md clue locations for better LLM accuracy.
Update baseline report to v2 (mean 69.0, 46 models, +2.2pp vs baseline 71.1%).
Consolidate README snapshots into baselines/readmes/.

py/services/agent/agent_service.py

@@ -416,7 +416,7 @@ class AgentService:
 
         try:
             raw_models = await list_base_models()
-            context["base_models"] = _format_base_models(raw_models)
+            context["base_models"] = self._format_base_models(raw_models)
         except Exception as exc:
             logger.debug("Failed to list base models: %s", exc)
             context["base_models"] = "</not available>"