Session titles were the truncated first prompt, so the picker filled
with 'Reply with exactly: OK' and five identical 'hows esphome' rows.
OpenCode background-generates a short title after the first exchange;
Pulse now does the equivalent: once the done event has reached the
client, the chat runtime asks the configured chat model for a <=50-char
title from the first user message and reply, then renames the session.
- Runs only on the first exchange; any customized title is left alone,
with a re-check before persisting to lose races against a concurrent
rename. Failure or timeout keeps the placeholder.
- Title requests pass the model-boundary sanitizer like normal turns
and record usage as assistant_session_title.
- Synchronous after done (no user-visible latency, no goroutine racing
service teardown), bounded at 20s for slow reasoning routes.
Verified by tests end-to-end (hook through Rename); live verification
on a real provider route pending while the dev backend sits in mock
assistant mode, which intercepts turns before the agentic path.
rcourtman
70a20f6ac7