9d3be84a0cb7baccc0b0570da4becf6866517517
removeMember now checks the planner count before deleting a planner
member. Throws ConflictException("Cannot remove the last planner")
when only one planner remains, matching the spec requirement in S4.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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