* fix: narrow exception in invoke separator resolution and add regression test
Narrow 'except Exception' to 'except (ImportError, ValueError, KeyError)'
in register_commands() invoke separator resolution. Add regression test
that verifies TypeError propagates instead of being silently swallowed.
* fix: remove duplicate pass statement in agents.py
Remove redundant second pass statement in the except block
for invoke separator resolution. The narrowed exception handler
now has a single clean pass statement.
Assisted-by: GitHub Copilot (model: mimo-v2-free, supervised)
