docs: add comprehensive frontend landing page plan and download design skills

Add detailed landing page development plan in docs/frontend_landing_plan.md:
- Complete landing page structure (Hero, Problem/Solution, Features, Demo, CTA)
- Design guidelines from downloaded skills (typography, color, motion, composition)
- Security considerations (XSS prevention, input sanitization, CSP)
- Performance targets (LCP <2.5s, bundle <150KB, Lighthouse >90)
- Responsiveness and accessibility requirements (WCAG 2.1 AA)
- Success KPIs and monitoring setup
- 3-week development timeline with daily tasks
- Definition of Done checklist

Download 10+ frontend/UI/UX skills via universal-skills-manager:
- frontend-ui-ux: UI/UX design without mockups
- frontend-design-guidelines: Production-grade interface guidelines
- frontend-developer: React best practices (40+ rules)
- frontend-engineer: Next.js 14 App Router patterns
- ui-ux-master: Comprehensive design systems and accessibility
- ui-ux-systems-designer: Information architecture and interaction
- ui-ux-design-user-experience: Platform-specific guidelines
- Plus additional reference materials and validation scripts

Configure universal-skills MCP with SkillsMP API key for curated skill access.

Safety first: All skills validated before installation, no project code modified.

Refs: Universal Skills Manager (github:jacob-bd/universal-skills-manager)
Next: Begin Sprint 3 landing page development

.opencode/skills/ui-ux-design-user-experience/references/11-ui-ux-design-tools.md

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+
+### Design Tools
+
+| Tool | Best For |
+|------|----------|
+| **Figma** | Collaborative design, prototyping, design systems |
+| **Sketch** | macOS UI design, plugins ecosystem |
+| **Adobe XD** | Integration with Adobe Creative Cloud |
+| **InVision** | Prototyping, collaboration |
+| **Axure** | Complex interactions, documentation |
+| **Balsamiq** | Low-fidelity wireframing |
+
+### Collaboration Tools
+
+- **Miro**: Online whiteboard, workshops, brainstorming
+- **Whimsical**: Flowcharts, wireframes, mind maps
+- **FigJam**: Figma's collaborative whiteboard
+- **Mural**: Visual collaboration, facilitation
+
+### Prototyping Tools
+
+- **Principle**: Mac-based animation tool
+- **ProtoPie**: Advanced interactions without code
+- **Framer**: Code-powered prototypes
+
+### Handoff Tools
+
+- **Zeplin**: Design specs, style guides, assets
+- **Avocode**: Design handoff, inspect tools
+- **Figma Inspect**: Built-in developer handoff
+
+---