Detach issue-facade from capabilities/ directory in preparation for
re-integration using new ReusableCapabilitiesArchitecture pattern.
Changes:
- Remove capabilities/issue-facade submodule
- Add detachment manifest with re-integration metadata
Next: Re-integrate as _issue-tracking/issue-facade/ (family-based organization)
Detachment manifest: capabilities/DETACHED-issue-facade.yaml
Original commit: 35daa514e59788250847cd706c43ea78f24c5c1d
