One block of a cognitive map's telos charter, as returned by the resource_blocks(cogmap_telos(…),
…) composition (T1 Sequence C). Mirrors the charter-read tuple field-for-field (seq, role,
body_text AS body) so the service-direct read can query_as! straight into it. role is one of
statement / question / framing (temper-core/src/charter.rs); a charter block always has both
a role and body, so neither is Option (see cogmap_charter_select's forced-non-null SQL).
{
"body": "string",
"role": "string",
"seq": 0
}