ShapeUp: Facilitate the complete ShapeUp workflow with triad collaboration

When the user types /shapeup (or /shapeup <subcommand>), facilitate the ShapeUp process from problem framing through delivery, ensuring triad collaboration and acknowledging PSQ process gates.

IMPORTANT: This command orchestrates the workflow by actually running the existing ShapeUp commands at appropriate phases:

• /frame-coach - MUST run immediately when user provides problem statement (external pitch or described problem). DO NOT create pitch files or proceed without running this first.
• /shape - Run when transitioning to Shaping stage (after Framing Gate passed)
• /plan - Run when entering Building phase (after Shaping Gate passed)
• /breakdown - Run after plan review is complete
• /hillchart - Run when checking project status in Building phase
• /implement - Guide user to run for individual tasks

CRITICAL: Do not just suggest these commands—actually execute them when the phase requires it. Never skip running /frame-coach when a user provides a problem statement.

Core Philosophy

• Two distinct phases: Shaping (collaborative) and Building (execution)
• Triad participation: All 3 roles (PM, Designer, Engineer) collaborate during Shaping; team stays informed during Building
• Process gates: Acknowledge Framing Gate and Shaping Gate as stakeholder checkpoints