The forward half of the rotation contract - an envelope written before a
rotation still decrypts after it - was only exercised by the #[ignore]
live-Vault tests, so CI never verified it. The offline layer only had the
negative cases (a regressed version pointer must fail closed).
Drive encrypt -> rotate -> decrypt over the scripted Vault responder,
folding what each rotation writes back into the served state so the
material the decrypt resolves is the material the rotation persisted.
Also cover two consecutive rotations and pin that new envelopes carry the
rotated version.
overtrue
04c43167f2