FLX-3101: declared contractDigest does not match the in-bundle contract
Family: seam/conformance (the 3000 band)
KERNEL-SPEC §8 recomputes the referenced FLUID document's digest from the bytes actually in the bundle and compares it with the digest the emit declares. A mismatch means the contract that was reviewed is not the contract that would ship, which is the one thing the seam exists to make impossible. Re-run plan to refresh the declared digest, or restore the contract the digest was taken over.
Look it up offline
$ fluxsim explain FLX-3101
Every code is listed in the error index.