Finalizer recovery runbook for wedged Crossplane restores

[patrick-hermann-sva]

Parent: #111

When a restore fails partway, MRs can wedge on finalizers (provider gone, external resource state ambiguous). Need a documented, tested recovery procedure.

Cover

• Detecting wedged MRs (kubectl get patterns, common finalizer values)
• Safe finalizer removal vs unsafe (external resource still exists)
• Re-adoption via crossplane.io/external-name after manual cleanup
• When to give up and recreate from Git

Deliverable

docs/runbooks/crossplane-restore-recovery.md.