Live Tier-3 testing (CLI agent -> a2a tools -> live peer gateway -> model)
surfaced two bugs the kwarg-style unit tests masked:
1. registry.dispatch calls handlers as handler(args, **kwargs) — args is the
whole dict positional. The handlers used keyword params (url=, agent=), so
the dict bound to the first param and .strip() raised
'dict object has no attribute strip'. Rewrote all three handlers to take
args: dict (matching the spotify/google_meet convention). Added a
registry-dispatch regression test that exercises the real call path the
direct-kwarg tests never hit.
2. The model repeatedly reached for agent_name= instead of agent= (6 retries
before success). Accept agent_name/name and message/text/task aliases so a
reasonable guess succeeds first try.
Verified live: client agent discovers the peer's Agent Card, calls it, and
gets the reply back (PONG round-trip confirmed on both client audit log and
peer conversation log). 39 plugin tests pass.
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