🗑️ chore: remove outdated instructions and migration documentation

api/hooks/ssr/AGENTS.md

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+# SSR and Caching
+
+Server-side rendering via goja (Go JS runtime) with HTML caching.
+
+## Request flow
+
+1. `get_read.js` receives the request and calls `lib/ssr-server.js`.
+2. `ssr-server.js` renders the Svelte app via `lib/app.server.js` and injects `window.__SSR_CACHE__`.
+3. On the client, `lib/ssr.js` hydrates using the injected cache data.
+4. Rendered HTML is stored in the `ssr` collection with dependency tracking.
+
+## Build
+
+- SSR bundle is built via `yarn build:server` and outputs to `lib/app.server.js`.
+- The build uses `--banner:js='// @ts-nocheck'` to suppress type errors in the generated bundle.
+
+## Cache invalidation
+
+- `clear_cache.js` hook invalidates SSR cache entries based on collection dependencies.
+- When content changes, only SSR entries that depend on the changed collection/entry are cleared.
+
+## Route validation
+
+SSR route validation is currently disabled and returns -1 in `config.js`; update this when enabling SSR per route.