gsd-capture

Mode routing:

• default (no flag): Capture as a structured todo for later work → add-todo workflow
• --note: Zero-friction idea capture (append/list/promote) → note workflow
• --backlog: Add an idea to the backlog parking lot (999.x numbering) → add-backlog workflow
• --seed: Capture a forward-looking idea with trigger conditions → plant-seed workflow
• --list: List pending todos and select one to work on → check-todos workflow