Migrate to unified skills architecture, add Copilot & Antigravity (v2.0.0)

All commands are now skills with user-invokable: true. Source lives in
source/skills/{name}/SKILL.md. Added VS Code Copilot (.agents/skills/)
and Google Antigravity (.agent/skills/) transformers. All 6 providers
output to skills directories only — no more commands/prompts dirs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

source/skills/adapt/SKILL.md

@@ -8,6 +8,7 @@ args:
   - name: context
     description: What to adapt for (mobile, tablet, desktop, print, email, etc.)
     required: false
+user-invokable: true
 ---
 
 Adapt existing designs to work effectively across different contexts - different screen sizes, devices, platforms, or use cases.

source/skills/animate/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: target
     description: The feature or component to animate (optional)
     required: false
+user-invokable: true
 ---
 
 Analyze a feature and strategically add animations and micro-interactions that enhance understanding, provide feedback, and create delight.

source/skills/audit/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: area
     description: The feature or area to audit (optional)
     required: false
+user-invokable: true
 ---
 
 Run systematic quality checks and generate a comprehensive audit report with prioritized issues and actionable recommendations. Don't fix issues - document them for other commands to address.

source/skills/bolder/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: target
     description: The feature or component to make bolder (optional)
     required: false
+user-invokable: true
 ---
 
 Increase visual impact and personality in designs that are too safe, generic, or visually underwhelming, creating more engaging and memorable experiences.

source/skills/clarify/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: target
     description: The feature or component with unclear copy (optional)
     required: false
+user-invokable: true
 ---
 
 Identify and improve unclear, confusing, or poorly written interface text to make the product easier to understand and use.

source/skills/colorize/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: target
     description: The feature or component to colorize (optional)
     required: false
+user-invokable: true
 ---
 
 Strategically introduce color to designs that are too monochromatic, gray, or lacking in visual warmth and personality.

source/skills/critique/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: area
     description: The feature or area to critique (optional)
     required: false
+user-invokable: true
 ---
 
 Conduct a holistic design critique, evaluating whether the interface actually works—not just technically, but as a designed experience. Think like a design director giving feedback.

source/skills/delight/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: target
     description: The feature or area to add delight to (optional)
     required: false
+user-invokable: true
 ---
 
 Identify opportunities to add moments of joy, personality, and unexpected polish that transform functional interfaces into delightful experiences.

source/skills/distill/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: target
     description: The feature or component to distill (optional)
     required: false
+user-invokable: true
 ---
 
 Remove unnecessary complexity from designs, revealing the essential elements and creating clarity through ruthless simplification.

source/skills/extract/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: target
     description: The feature, component, or area to extract from (optional)
     required: false
+user-invokable: true
 ---
 
 Identify reusable patterns, components, and design tokens, then extract and consolidate them into the design system for systematic reuse.

source/skills/harden/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: target
     description: The feature or area to harden (optional)
     required: false
+user-invokable: true
 ---
 
 Strengthen interfaces against edge cases, errors, internationalization issues, and real-world usage scenarios that break idealized designs.

source/skills/normalize/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: feature
     description: The page, route, or feature to normalize (optional)
     required: false
+user-invokable: true
 ---
 
 Analyze and redesign the feature to perfectly match our design system standards, aesthetics, and established patterns.

source/skills/onboard/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: target
     description: The feature or area needing onboarding (optional)
     required: false
+user-invokable: true
 ---
 
 Create or improve onboarding experiences that help users understand, adopt, and succeed with the product quickly.

source/skills/optimize/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: target
     description: The feature or area to optimize (optional)
     required: false
+user-invokable: true
 ---
 
 Identify and fix performance issues to create faster, smoother user experiences.

source/skills/polish/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: target
     description: The feature or area to polish (optional)
     required: false
+user-invokable: true
 ---
 
 **First**: Use the frontend-design skill for design principles and anti-patterns.

source/skills/quieter/SKILL.md

@@ -5,6 +5,7 @@ args:
   - name: target
     description: The feature or component to make quieter (optional)
     required: false
+user-invokable: true
 ---
 
 Reduce visual intensity in designs that are too bold, aggressive, or overstimulating, creating a more refined and approachable aesthetic without losing effectiveness.

source/skills/teach-impeccable/SKILL.md

@@ -1,6 +1,7 @@
 ---
 name: teach-impeccable
 description: One-time setup that gathers design context for your project and saves it to your AI config file. Run once to establish persistent design guidelines.
+user-invokable: true
 ---
 
 Gather design context for this project, then persist it for all future sessions.