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openspec/changes/service-workers/tasks.md

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+## 1. Setup
+
+- [x] 1.1 Add `sw.js` to site root output (place in `site/public/sw.js`)
+- [x] 1.2 Add service worker registration to the base layout (register only in production)
+
+## 2. Pre-cache Site Shell
+
+- [x] 2.1 Implement versioned cache names and an explicit cache version constant
+- [x] 2.2 Implement `install` handler to pre-cache critical shell assets
+- [x] 2.3 Implement `activate` handler to delete old version caches
+
+## 3. Runtime Caching
+
+- [x] 3.1 Implement network-first strategy for navigation/document requests with cache fallback
+- [x] 3.2 Implement cache-first strategy for images/media with network fallback
+- [x] 3.3 Add a bounded eviction policy for media cache size
+
+## 4. Verification
+
+- [ ] 4.1 Verify service worker registers in production build and does not register in dev
+- [ ] 4.2 Verify repeat navigation and asset loads hit cache (Chrome DevTools Application tab)
+- [ ] 4.3 Verify a new deploy triggers cache version update and old caches are removed