ReissueCredentials marked the escrow stale on every re-issue, on precautionary
grounds — the box's re-apply MIGHT mint a fresh repository password. It usually
does not. A stale flag withholds restic_pw_sha256 from the ACK, which stops the
controller's auto-confirm, which leaves EscrowState pending, which makes
OffboxRunnable false: every off-site backup refused on a box whose key was never
in doubt — and the customer told to re-run the one ceremony that would have
superseded the key just recovered.
The case it guessed at is measured elsewhere: the controller's Scenario-F
re-check compares the sealed hash against the live repo password on every ACK
(and the mark was BLINDING it by emptying that hash), and R-197's
offsite_repo_key_changed fires on a proven difference across a supersession.
offsite_reissued is unchanged. MarkEscrowStale is kept without a caller so a
future EVIDENTIAL writer has the mechanism, with a test pinning it live.
TestReissue_InvalidatesEscrow is replaced by its exact inverse.
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