feat: verify status is suspended

[ANISH-SR]

Summary of Changes

• All Resume* processors (Location, Exchange, Contributor, Device, User, Link) now require status == Suspended, otherwise return DoubleZeroError::InvalidStatus.
• process_resume_link already enforced the correct status check and was left unchanged.
• Every resume integration test now asserts a second resume fails with Custom(7) (InvalidStatus).
• Resume operations are now strictly single-use from Suspended, with tests validating both success and misuse.

Testing Verification

• All rust checks green

Closes #2222