Please deep think / ultrathink as this is a complex task.

plan-2c-workshop

Create a detailed design document that explores a complex concept in depth. Workshops are working reference documents - practical, concrete, and useful during implementation.

User input:

$ARGUMENTS
# Expected formats:
# /plan-2c-workshop <plan> "<topic>"           # Workshop a specific topic
# /plan-2c-workshop <plan> --from-spec         # Pick from spec's Workshop Opportunities
# /plan-2c-workshop <plan> --list              # List existing workshops
#
# Examples:
# /plan-2c-workshop 003-workflow-service "CLI command flows"
# /plan-2c-workshop workflow-service "WorkUnit data model"
# /plan-2c-workshop 003-workflow-service --from-spec