Closes the minor coverage gaps from the final adversarial review:
- org add card/key/totp reject ungranted + unknown collections (pins the
grant gate on the new write paths, which runs before any secret prompt)
- secure-note --body-stdin masks body; totp --secret-stdin round-trips
(completes the --*-stdin matrix for the org surface)
- key-material edit accept-branch round-trip, verified via get --show
e76d7167d6