v1.4.2

Verifier 1.4.2: verifies sigilbase-evidence/1 through /1.4

Anchor validation holds every issuer certificate in a timestamp token's
chain to CA rules: basicConstraints cA, keyCertSign where keyUsage is
present, validity at genTime, and pathLenConstraint.

Checkpoint validation holds every checkpoint to its signing key's active
window, as stated in the manifest, comparing the seal time in the signed
preimage against the key's created_at and retired_at.

The release carries the conformance corpus and the golden vectors that
every implementation is held to.

sha256 of verify.php:
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