The session-list block serves projection values only from the host's
projection cache, so a relative that never attached since the timeline unit
last changed lists pressure-only (occupancy without composition) and its
ring degraded to the single fallback arc — every subagent ring looked green
until its session was opened. The card now fetches those nodes' slim heads
from the /api detail route (one read per session per page, failures sticky)
and re-folds the forest with the row's missing contextTimeline injected; a
row's own value always wins, and any fetch failure degrades back to the
pressure-only ring.