docs(issue-17): wrapper.py imports only the stdlib, the package it runs in loads paho (N1)

"Stdlib only" is true of the module, not of how the wrapper runs it:
`python -m lib_py.delegation.wrapper` imports lib_py/delegation/__init__.py
first, which loads the service and paho-mqtt. The docstring now says so; the
wrapper's $PY already needs paho. The run path is unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HCGpJXhSZasJLU38ksDghe

.agents/skills/lib_py/delegation/wrapper.py

@@ -21,8 +21,12 @@ checks that the wrapper is still alive throughout both waits and before each
 side effect, and leaves without closing or publishing once it is gone - as the
 same loops in bash ended with the wrapper.
 
-Stdlib only and Python 3.9 (macOS /usr/bin/python3); registry.py and
-publish_event.py run as the processes the wrapper ran, with its interpreter.
+This module imports only the standard library and runs on Python 3.9 (macOS
+/usr/bin/python3). The wrapper runs it as `python -m lib_py.delegation.wrapper`,
+which imports the package first: lib_py/delegation/__init__.py loads the
+service and with it paho-mqtt, so the wrapper's $PY needs paho - as it always
+did for the subscriber and publish_event.py. registry.py and publish_event.py
+run as the processes the wrapper ran, with its interpreter.
 """
 from __future__ import annotations