Ensure model verbosity is consistent

[gundermanc]

Scope: Consistent Model Verbosity

Goal: Reduce terminal noise and solve the "excessive scrolling" problem by moving to a Topic-Action-Summary model.

Phase 1: Prompting & Behavioral Tuning (Immediate Fixes)

• [Task] Audit current System Instructions for verbosity triggers #21449 Audit current System Instructions for verbosity triggers
• [Task] Implement 'Milestone-Driven' prompting strategy #21450 Implement "Milestone-Driven" prompting strategy
• [Task] Establish Behavioral Evals for Verbosity #21451 Establish Behavioral Evals to measure noise reduction

Phase 2: Structural UX & Tooling (Long-term Solution)

• [Task] Design and implement a 'ui_task_group' tool in Core #21452 Design/implement ui_task_group tool in Core
• [Task] Develop Collapsible 'Accordion' UI in CLI (Ink) #21453 Develop collapsible "Accordion" UI in CLI (Ink)
• [Task] Final Integration: Auto-collapse completed task groups #21454 Final Integration: Auto-collapse completed task groups with outcome summaries