docs: Update progress for Task 7 completion

Ralph/IMPLEMENTATION_PLAN.md

@@ -106,7 +106,7 @@ src/
 
   Create `components/Hero.tsx`. Port hero section from concept.html: centered layout, name (clamp 36-52px), job title (muted), location pill (teal border), summary paragraph (max-width 560px). Four vital sign metric cards in a row: "10+ Years Experience", "Python/SQL/BI Analytics Stack", "Pop. Health Focus Area", "NHS N&W System". Cards have teal border-top, hover elevation. Responsive: 2x2 grid on tablet, stacked on mobile.
 
-- [ ] **Task 7: Build Skills section with SVG gauges**
+- [x] **Task 7: Build Skills section with SVG gauges**
 
   Create `components/Skills.tsx`. Three skill categories: Technical (8 skills, teal), Clinical (6 skills, coral), Strategic (4 skills, teal). Each skill has circular SVG progress gauge using calculated stroke-dashoffset. Scroll-triggered animation: gauges fill when section enters viewport, staggered by 100ms. Port all 18 skills with correct percentages from concept.html.
 

Ralph/progress.txt

@@ -65,6 +65,28 @@
 
   <!-- Iterations will be logged here as tasks are completed -->
 
+### Iteration 6 — Task 7: Build Skills section with SVG gauges
+- **Completed**: Task 7 - Build Skills section with SVG gauges
+- **Files created**:
+  - `src/hooks/useScrollReveal.ts` - IntersectionObserver hook for scroll-triggered animations
+  - `src/components/Skills.tsx` - Skills section with SVG circular progress gauges
+- **Files modified**:
+  - `src/App.tsx` - Replaced skills placeholder with Skills component
+- **Design decisions**:
+  - SkillGauge component with SVG circular progress using stroke-dashoffset animation
+  - IntersectionObserver triggers when section is 15% visible
+  - Staggered animation: 100ms delay between each gauge
+  - Gauge radius 34px, circumference 213.628, rotates -90deg to start from top
+  - Transition duration 1.2s ease-out for gauge fill animation
+  - Framer Motion for card entrance animations (opacity 0→1, y 16→0)
+  - Color-coded: Technical (teal), Clinical (coral), Strategic (teal)
+  - Responsive grid: auto-fit with minmax(140px, 1fr)
+- **Quality checks**: `npm run typecheck` ✓, `npm run lint` ✓, `npm run build` ✓
+- **Learnings**:
+  - SVG stroke-dashoffset animation triggered via React state + CSS transition works smoothly
+  - IntersectionObserver cleanup is critical to avoid memory leaks
+  - Calculating baseDelay per category allows grouped stagger effects
+  
 ### Iteration 3 — Task 4: Build ECGAnimation component
 - **Completed**: Task 4 - Build ECGAnimation component
 - **Files created**: