qcap revoke (#cli-006)

[jvanulde]

Add revocation locally and push to registry.

[jvanulde]

Status: not implemented. Plan: signed revocations.json distributed via registry; CLI emits and verifies against revocations list.

[edip-dev-01]

Addressed in fork commit edip-dev-01/q-cap@0290c6f: adds qcap revoke to emit/update a signed revocations.json and enforces revoked capabilities during qcap open. Pending upstream merge: edip-dev-01@0290c6f

[edip-dev-01]

Closed by merged PR #39: #39