fix: replace double-lambda with functools.partial, close from_env config_path gap

- _submit_background and _prefetch_provider: replace unreadable
  (lambda inner: (lambda: ctx.run(inner)))(fn) with functools.partial(ctx.run, fn)
- from_env(): set config_path=resolve_config_path() so bound_config_path()
  doesn't re-resolve from ContextVar on daemon threads (the exact bug
  the PR fixes for from_global_config)

Review follow-ups for salvaged PR #83525.

agent/memory_manager.py

@@ -562,10 +562,10 @@ class MemoryManager:
         # Propagate the caller's contextvars (profile HERMES_HOME override)
         # to the prefetch thread — see _submit_background.
         import contextvars
+        from functools import partial
 
-        _ctx = contextvars.copy_context()
         thread = threading.Thread(
-            target=lambda: _ctx.run(_run),
+            target=partial(contextvars.copy_context().run, _run),
             daemon=True,
             name=f"memory-prefetch-{provider.name}",
         )
@@ -743,9 +743,10 @@ class MemoryManager:
         from the worker would silently land on the default profile.
         """
         import contextvars
+        from functools import partial
 
         ctx = contextvars.copy_context()
-        fn = (lambda inner: (lambda: ctx.run(inner)))(fn)
+        fn = partial(ctx.run, fn)
         executor = self._get_sync_executor()
         if executor is None:
             if self._shutting_down:

plugins/memory/honcho/client.py

@@ -491,6 +491,7 @@ class HonchoClientConfig:
         api_key = get_secret("HONCHO_API_KEY")
         base_url = os.environ.get("HONCHO_BASE_URL", "").strip() or None
         timeout = _resolve_optional_float(os.environ.get("HONCHO_TIMEOUT"))
+        _resolved_path = resolve_config_path()
         return cls(
             host=resolved_host,
             workspace_id=workspace_id,
@@ -500,6 +501,7 @@ class HonchoClientConfig:
             timeout=timeout,
             ai_peer=resolved_host,
             enabled=bool(api_key or base_url),
+            config_path=_resolved_path,
             hermes_home=get_hermes_home(),
         )