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-spacing-system/SKILL.md

@@ -69,6 +69,14 @@ Desktop (1440px): 12 columns, margin [value], gutter [value], max content width
 - [ ] Component conventions cover common decisions
 - [ ] Figma implementation steps included
 
+## Anti-Patterns
+
+- [ ] Do not create a spacing scale with arbitrary values — the scale must follow a consistent mathematical ratio (e.g. 4px base, 8-4-2 system)
+- [ ] Do not define spacing tokens without Figma implementation instructions — token names alone are not actionable
+- [ ] Do not create a spacing system that doesn't account for component-level spacing conventions — global tokens and component usage must both be documented
+- [ ] Do not skip grid definitions — spacing without a grid system is incomplete layout foundation documentation
+- [ ] Do not produce a spacing system that ignores responsive behaviour — define how spacing adapts across breakpoints
+
 ## Example Trigger Phrases
 - "Create a spacing system for our Figma design system"
 - "Define our spacing tokens for Figma"