Remove the entire YAML-based workflow system in preparation for
redesigning templates as native Beads.
Removed:
- cmd/bd/templates/workflows/*.yaml
- cmd/bd/workflow.go
- internal/types/workflow.go (WorkflowTemplate types)
The new design will use regular Beads with a template label,
and a clone-with-substitution operation for instantiation.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>