trust_tier
How a participant's text is presented to agents, derived from the signer's grant chain: the owner, or any other participant, human or agent alike, whose grant's harness and model terms name what it runs. Tiers shape presentation only; enforcement is grants and protected paths.
| Value | Meaning |
|---|---|
owner | The project owner's key, which needs no grant. |
participant | Any other key with a grant: a person, an agent, a runner. |
Cardinality: 2.