The branch-render guard landed earlier (78b133127d); what remained was
provenance: a projected continuation tip rendered as a brand-new
session. list_sessions_rich now stamps continuation_kind='compression'
on projected rows, StoredSessionRow carries it (contracts regenerated),
and the sidebar session row labels continuations with their lineage
root instead of a fresh-conversation affordance. The live tip stays
listable while naming its parent; sealed chain segments stay hidden.
Co-authored-by: wave-2 worker D <wave2d@hermes-triage>
da4a1ffd08