F14: the lockstep int-spec header still described the pre-F6 two-clause set with
'iff' — add the content-JSON text-node clause so it matches embeddablePredicate.
F15: remove the redundant expect(ttl).toBeLessThanOrEqual(120) that followed
expect(ttl).toBe(120).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>