`_classify_responses_issuer` reimplemented endpoint canonicalisation with
its own urlsplit/urlunsplit pass. The repo already owns that logic in
`hermes_cli/route_identity.py::normalize_route_base_url` (stdlib-only,
used by agent/backend_identity.py), so delegate to it.
Reasoning items persisted before canonicalisation were stamped with the
raw `other:<agent.base_url>` (trailing slash, host case). Comparing them
verbatim against the now-canonical `current_issuer_kind` marked them
foreign and dropped them on the very endpoint that minted them. Run the
persisted stamp through the same canonicaliser (`_canonical_issuer_kind`,
non-`other:` kinds untouched) before comparing.
Also fixes the `_chat_messages_to_responses_input` docstring, which still
stated the pre-stack rule that legacy endpoint-stamped items drop when the
current model is known; the stack replays them on a matching issuer.
00f0d92be0