feat(memory): episodic surface + tab + RRF rerank shared module (clean redeploy)

15th surface (episodic, killinchu-hosted). Optional RRF rerank in szl_rag (default unchanged). MODELED. Nothing in locked-8; Lambda stays Conjecture 1.

static/3d/holographic.html

@@ -73,6 +73,7 @@ const SURFACES = [
   { id: "interpretability", title: "Interpretability", mod: "/static/3d/surfaces/interpretability.js" },
   { id: "worldmodel", title: "World Model", mod: "/static/3d/surfaces/worldmodel.js" },
   { id: "qec", title: "Topological QEC", mod: "/static/3d/surfaces/qec.js" },
+  { id: "episodic", title: "Episodic Memory", mod: "/static/3d/surfaces/episodic.js" },
   { id: "energy",      title: "Energy",      mod: "/static/3d/surfaces/energy.js" },
   { id: "fabric",      title: "Fabric",      mod: "/static/3d/surfaces/fabric.js" },
   { id: "pnt",         title: "PNT",         mod: "/static/3d/surfaces/pnt.js" },