Add 'Yes, using Claude command [name]' option to plan mode for custom workflow integration

Problem

Current plan mode only offers binary Yes/No options when presenting execution plans. This creates workflow friction for users who prefer to execute plans using custom Claude commands rather than the default execution method.

Proposed Solution

Add a third option to plan mode: 'Yes, using Claude command [command-name]' that allows users to execute the validated plan using their preferred custom Claude command.

Use Case

Many users develop custom Claude commands (such as /work-on, /implement, /systematic-approach, etc.) that provide structured, methodical approaches to task execution. These users currently must:

1. Review the plan in plan mode
2. Select 'No' to decline default execution
3. Manually invoke their preferred command (e.g., '/work-on [task description]')

This breaks the flow and duplicates effort since the plan validation step becomes disconnected from the execution step.

Benefits

• Maintains Plan Validation: Users still get the benefit of reviewing and approving plans before execution
• Workflow Integration: Seamlessly integrates with users' custom development methodologies
• Reduced Friction: Eliminates the No → custom command workaround pattern
• Flexibility: Accommodates different development styles and project-specific workflows
• User Experience: Streamlines transition from planning to systematic execution

Example Implementation

Plan mode could:

1. Detect available Claude commands in the user's setup
2. Offer them as execution options alongside Yes/No
3. Pass the plan context to the selected command for systematic execution

Example User Flow

Instead of:

Enable:

Target Users

• Project-based developers who prefer systematic workflows
• Users with established custom Claude command patterns
• Teams that have standardized on specific development methodologies
• Anyone who finds value in both plan validation AND structured execution

This enhancement would provide significant value for users who rely on custom Claude commands for consistent, high-quality development workflows while maintaining the safety and clarity benefits of plan mode.