Steps with issue tickets remain on hold if no redline steps are created

[abbyfluoroethane]

[CST-100]

Obsolete under the R2 hold model (PR #56 line). The stored ON_HOLD choreography this bug describes was deleted: holds now DERIVE from undispositioned containment-bearing issues and lift at the disposition signature — no redline steps required (covered by tests/unit/test_execution_holds.py::test_disposition_lifts_bound_hold and the §6 'hold lift on disposition' group). Redline rework, when authorized, separately gates COMPLETE/SKIP until the rework op completes, so the inverse failure (disposition signed but rework stranded) is also closed.