Cleaned dead code and updated documents

docs/PSR_VS_EDGE.md

@@ -14,6 +14,15 @@ Works on a $5 VPS with local Bun. **No Edge required.** PSR is part
 of the protocol; it's available to every Mizan deployment regardless
 of hosting.
 
+> Current state: the Edge manifest records each context's
+> `render_strategy` (`"psr"` for public, `"dynamic_cached"` for
+> user-scoped) — see `mizan/export/` and the `export_edge_manifest`
+> management command — and the SSR bridge can render a component to
+> HTML. The render-on-mutation orchestration that wires those together
+> (mutation → trigger local render → store HTML) is not yet present in
+> the open-source backends; it is the manifest-driven behavior the
+> Edge layer consumes.
+
 ## Edge Delivery — Mizan Render (Paid Product)
 
 Pre-rendered HTML cached globally on Cloudflare CDN.