A bot's canonical chat is the relationship — /new inside one would fork it into
a scratch session, so the composer reroutes /new to /compact there. The guard
deciding "is this chat the canonical one" read host.activeSessionId, which is
not on the host: the real atoms are host.state.activeSessionId (runtime id) and
host.state.focusedStoredSessionId (stored id). The optional chain swallowed it,
the comparison ran against null every turn, and /new reset forever-chats for as
long as the guard shipped.
It reads the focused STORED id now, which is the id space canonical_session
reports in. The comparison itself moves into isCanonicalChatOnScreen so a test
can drive it — matching either the durable registry row or the
compression-lineage tip, since a compacted Bot Chat is on screen under its tip
id while the registry still names it by the root.
Brooklyn Nicholson
32ca343c83