refactor(agent): rename agent_cli to metadata_ops, strip temp debug logs

- Rename py/agent_cli/ -> py/metadata_ops/ (module was never agent-related)
- Rename tests/agent_cli/ -> tests/metadata_ops/
- Remove 9 low-value/debug INFO log points across agent_handlers.py,
  agent_service.py, llm_service.py, and metadata_ops/__init__.py
- Keep LLM raw response at DEBUG level for diagnostics
- Consolidate per-model progress + LLM result into single concise
  log line with basename instead of full path
- Update package/class/method docstrings to clarify this is a
  pipeline infrastructure, not a true agent loop

tests/enrich_hf_validation/config.py

@@ -72,7 +72,7 @@ _FALLBACK_BASE_MODELS: List[str] = [
 async def init_supported_base_models() -> None:
     """Populate ``SUPPORTED_BASE_MODELS`` from the production codebase.
 
-    Calls ``py.agent_cli.list_base_models()`` which merges a hardcoded
+    Calls ``py.metadata_ops.list_base_models()`` which merges a hardcoded
     fallback with models fetched from the CivitAI API.  When the call
     fails (e.g. offline, API error), falls back to ``_FALLBACK_BASE_MODELS``.
 
@@ -80,7 +80,7 @@ async def init_supported_base_models() -> None:
     ``run_validation.main()``, not at module level).
     """
     try:
-        from py.agent_cli import list_base_models
+        from py.metadata_ops import list_base_models
 
         models = await list_base_models()
         if models: