Add map import and export with durable refresh progress

shared/protocol.ts

@@ -49,6 +49,8 @@ export const datasetSchema = z
       ),
     dimension: z.literal("minecraft:overworld"),
     source: z.enum(["plugin", "fabric"]),
+    // Portable map imports contain rendered images rather than capture inputs.
+    mediaFormat: z.literal("webp").optional(),
     name: z.string().min(3).max(80),
     description: z.string().max(2000).default(""),
     serverName: z.string().min(2).max(80),
@@ -88,16 +90,23 @@ export const datasetSchema = z
       });
     const paths = new Set(d.assets.map((asset) => asset.path));
     const requiredPaths =
-      d.source === "plugin"
-        ? ["terrain.json.gz"]
-        : [
-            "map.png",
-            ...(d.availableViewpoints ?? d.viewpoints)
-              .filter((point) => !point.assetRoot)
-              .flatMap((point) =>
-                faces.map((face) => `${point.id}/${face}.png`),
-              ),
-          ];
+      d.mediaFormat === "webp"
+        ? [
+            "map.webp",
+            ...d.viewpoints.flatMap((point) =>
+              faces.map((face) => `${point.id}/${face}.webp`),
+            ),
+          ]
+        : d.source === "plugin"
+          ? ["terrain.json.gz"]
+          : [
+              "map.png",
+              ...(d.availableViewpoints ?? d.viewpoints)
+                .filter((point) => !point.assetRoot)
+                .flatMap((point) =>
+                  faces.map((face) => `${point.id}/${face}.png`),
+                ),
+            ];
     for (const path of requiredPaths) {
       if (!paths.has(path))
         ctx.addIssue({
@@ -135,6 +144,8 @@ export const datasetSchema = z
 // Media provenance is assigned by the server after the owner accepts a contribution.
 export function parseUploadManifest(value: unknown) {
   const manifest = datasetSchema.parse(value);
+  if (manifest.mediaFormat)
+    throw new Error("Use map import for rendered archives");
   manifest.serverAddress =
     normalizeServerAddress(manifest.serverAddress) ?? undefined;
   for (const p of [