Improved Workspace assistant

Align Workspace assistant prompt and reference rules

Selected Workspace assistant prompts keep the global follow-up rules and the administrator reference describes selected requests accurately.

Selected Workspace assistant prompts now retain the global rule for when a follow-up offer or question is allowed, together with explicit write, evidence, completeness, and unsupported-work guidance. The administrator reference distinguishes legacy instruction text and selected catalog fragments, and explains that selection-on requests expose only the tools selected for that run.