fix(skills): add Anti-Patterns and fix descriptions for remaining skills (batch 3)

Processed 27 skills: teaching-lesson-plan through feature-prioritisation and all figma skills.
Added Anti-Patterns sections to all 27 skills.
Added Quality Checks section to financial-due-diligence (was missing entirely).
Converted user-research-synthesis Quality Standards to binary checkbox format.
Rewrote descriptions for figma-design-critique-pm, figma-design-qa, figma-design-review,
team-health-check, and user-interview-synthesis.

https://claude.ai/code/session_01MuGKn3a3Gbqoe8uM5Lmuqt

skills/figma-variant-matrix/SKILL.md

@@ -70,6 +70,14 @@ For each state, list only what changes from Default:
 - [ ] Token mapping covers all visual properties
 - [ ] Disabled state uses layer-level properties not opacity
 
+## Anti-Patterns
+
+- [ ] Do not create a variant matrix with properties that overlap or conflict — each property must be independently variable
+- [ ] Do not use opacity for disabled states — disabled states must use layer-level properties, not opacity
+- [ ] Do not enumerate every mathematical combination if many are invalid — document only valid, buildable combinations
+- [ ] Do not define variants without considering responsive behaviour — specify which properties change across screen sizes
+- [ ] Do not produce a matrix without Figma implementation guidance — variant naming conventions must follow Figma's property system
+
 ## Example Trigger Phrases
 - "Define the variants for a [component] in Figma"
 - "What states does my [component] need?"