Constant MINIMAL_VALID_JCS 

pub const MINIMAL_VALID_JCS: &str = r#"{"actor":{"class":"AUTONOMOUS","id":"actor:robot-alpha-01","operator":"operator:wilder-robotics"},"adapter":{"ackDigest":"sha256:4444444444444444444444444444444444444444444444444444444444444444","ackProvenance":"THIRD_PARTY","endpoint":"endpoint:res-001","mode":"WRITE_ONLY","postedAt":"2026-10-15T14:00:05Z","system":"example.ticketing"},"attestation":{"bindingMode":"DIRECT_WITNESS","measuredBoot":{"chain":"sha256:98a6efd412bb768ea7f090e8228401c11bc72a7caae44170395445c097d5ffa1","components":[{"digest":"sha256:2222222222222222222222222222222222222222222222222222222222222222","name":"bl1"}]},"platformEvidence":{"digest":"sha256:cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc","encoding":"opaque/1"},"sealedEvidence":{"digest":"sha256:3333333333333333333333333333333333333333333333333333333333333333","encoding":"opaque/1","sizeBytes":4096},"teeClass":"arm.cca","validity":{"notAfter":"2026-10-15T15:00:00Z","notBefore":"2026-10-15T13:00:00Z"},"witnessKey":"key:tee:res-001-witness-01"},"chain":{"hash":"sha256:6de1b8b2c641536b35fada1a7ee233c68284cf3788408a7160d5f525c309d2b3","prevHash":null,"seq":0},"engagement":{"envelopeConformance":"WITHIN","evidenceDigest":"sha256:1111111111111111111111111111111111111111111111111111111111111111","id":"eng:res-001:20261015-140000","outcomeClass":"COMPLETED","type":"patrol","window":{"end":"2026-10-15T14:00:00Z","start":"2026-10-15T13:30:00Z"}},"id":"uuid:00000000-0000-4000-8000-000000000001","issuerAffiliation":"NOT_DISCLOSED","site":{"class":"residential","envelope":{"digest":"sha256:0000000000000000000000000000000000000000000000000000000000000000","geobounds":null,"id":"env:res-001:2026-Q4","temporal":{"ends":null,"starts":"2026-10-01T00:00:00Z"}},"id":"site:res-001"},"spec":"wilder.pser/0.5","ts":"2026-10-15T14:00:00Z"}"#;

Expected JCS bytes for the normalized minimal payload.