AirBase query contract

Search the resolved Base by concrete terms, then follow populated record links by their returned IDs.
Relationship traversal is limited to four hops. Report partial, truncated, missing/failed reverse scans and depth-limit flags as limits on the result.
A missing reverse scan or incomplete traversal is not proof that no matching relationship exists.
Use live table and field IDs from returned schemas. Do not infer relationships from names, groups or expected wiring conventions.
Return the shortest supported evidence chain and identify its first missing link.