A plugin's on_session_finalize hook can now return a str or {"message": str}
and Hermes shows it at the session boundary without starting a turn or
rewriting the model reply:
- CLI /new: printed before the new session; CLI quit: printed above the
exit summary; one-shot -q/-z: printed to stderr (stdout stays the answer)
- TUI: session.close returns the messages; /new shows them as system lines
- Gateway /new and shutdown: sent to the owning chat via the adapter, while
adapters are still connected
on_session_end stays observer-only: it fires after every turn, not at a
session boundary. Gateway finalize dispatch moves to
gateway/run_shutdown_session_end.py.
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