The warn-once reporter added for hooks (and for PluginManager.invoke_middleware)
left the execution chain out: hermes_cli/middleware.py::_run_execution_chain — the
tool_execution / llm_execution frames that run once per tool or LLM call — still
logged "Middleware '%s' callback %s raised" at WARNING on every invocation. A
mis-declared callback (e.g. a signature naming tool_data) therefore flooded the
log exactly like the hook case #111922 reported: 5 calls -> 5 WARNING lines.
Route the frame's except through the manager's _report_hook_failure with the
"Middleware" surface label, so the first failure warns (listing the fields the
middleware does provide) and identical repeats go to DEBUG; the set is already
forgotten on plugin reload. The frame's skip-and-continue semantics are unchanged.
Part of #111922
0f98d5a1d9