Labels

Markers, never data

A label is a key=value pair on any record and on a run. Metric-label semantics: selection and grouping, never data. Labels are set at declaration and changed by a record command; the system never interprets the values.

Keys under the reserved graphene.io/ prefix are system labels, written only by the system; user input with this prefix is rejected. graphene.io/run names the run that created the record — stable across transfers, unlike the owner.

Selection

A selector is kind + phase + owner + labels; every set field must match. Selection works the same everywhere labels appear — listing records, choosing agents, filtering runs:

Matching is equality and "one of" — nothing else. There are no comparisons, no expressions, no versions: a selector the system could interpret would be one more thing to be wrong about.