fetchGraph({root, depth:1}) is backed by blast_radius, which only
walks outgoing edges — so it could never surface an edge some other
entity points at this one (e.g. host:hubris —hosts→ lxc:sophia) unless
that other entity happened to also be reachable going forward from
here. The Outgoing/Incoming split was filtering correctly, but
"Incoming" was starved of data by construction.
Switch to GET /entities/{id}/relations?direction=both — a dedicated
endpoint that matches on source_id OR target_id directly — via a new
fetchEntityRelations(). Simplifies the incoming/outgoing derivation
too, since every relation returned is now actually incident to the
entity (no more sibling-edge filtering needed).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>