docs: Add code review and best practices assessment

docs/CODE_REVIEW.md

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+# Code Review: The Fold Within
+
+## Architecture Assessment
+
+### Current State
+- Minimal static site with custom Node.js index generator
+- Markdown files served directly by Cloudflare Pages
+- Index generation runs at build time
+- No separate HTML templates for fieldnotes
+
+### Issues Identified
+
+#### 1. Rendering Pipeline
+```
+Current: Markdown → Cloudflare Pages (built-in) → HTML
+Problem: Can't control metadata display, timestamps
+```
+
+#### 2. Timestamp Display
+```
+Problem: Sidebar shows ctime, not originalDate
+Fix: Generator must output originalDate, template must use it
+```
+
+#### 3. No Frontend Templates
+```
+Current: index.json has data, but templates don't use it
+Fix: Create HTML templates with full metadata injection
+```
+
+#### 4. Missing Build Configuration
+```
+Missing: _routes.json, _headers, _redirects
+Impact: Can't optimize caching, redirects, headers
+```
+
+---
+
+## Best Practices Recommendations
+
+### Phase 1: Quick Wins (This Session)
+- [x] Enhanced index generator with full metadata
+- [ ] Replace generate-index.mjs with enhanced version
+- [ ] Update Cloudflare Pages build command
+
+### Phase 2: Infrastructure (This Week)
+- [ ] Add _headers for caching, security headers
+- [ ] Add _routes.json for URL handling
+- [ ] Create HTML template for fieldnotes
+- [ ] Build step: markdown → HTML with metadata
+
+### Phase 3: Full SSG (Future)
+- [ ] Migrate to proper SSG (Astro, Hugo, or custom)
+- [ ] Templates separated from content
+- [ ] Component-based frontend
+- [ ] Full SEO optimization
+
+---
+
+## Code Quality Metrics
+
+### Strengths
+✅ Clean index generation logic
+✅ Separation of concerns (extractors, parsers, generators)
+✅ Proper error handling
+✅ Cron-based automation
+✅ Multi-platform mirroring
+
+### Areas for Improvement
+❌ No linting (ESLint, Prettier)
+❌ No testing (Jest, PyTest)
+❌ No type checking (TypeScript, Pyre)
+❌ No code coverage tracking
+❌ No documentation generation
+
+---
+
+## Action Items
+
+### Immediate
+1. Replace generate-index.mjs with enhanced version
+2. Test enhanced generator locally
+3. Push to trigger Pages rebuild
+
+### Short-term
+1. Add _headers for security + caching
+2. Create fieldnote HTML template
+3. Document build process
+
+### Long-term
+1. Add linting + formatting
+2. Add tests
+3. Migrate to proper SSG