Live-verify the puppet DM path and expose the backend choice

poc/public/media.js

@@ -95,6 +95,25 @@
                     });
                 }
             }
+
+            // DMs and group DMs: the bot cannot see them, so they always use the puppet.
+            try {
+                const dms = await window.VK.api.get("/api/dms?limit=50");
+                for (const dm of dms ?? []) {
+                    const names = (dm.recipients ?? [])
+                        .map(recipient => recipient.username)
+                        .filter(Boolean)
+                        .join(", ");
+                    state.channels.push({
+                        id: dm.id,
+                        guildId: null,
+                        label: `${dm.name || names || "DM"} (${dm.type === 3 ? "group DM" : "DM"})`
+                    });
+                }
+            } catch {
+                // no cached DMs yet
+            }
+
             state.loadedChannels = true;
         } catch {
             state.channels = [];

poc/src/control-bridge.ts

@@ -770,11 +770,15 @@ function buildServer(): McpServer {
                     .enum(["links", "download"])
                     .optional()
                     .describe("links indexes URLs (default); download fetches attachment bytes"),
+                backend: z
+                    .enum(["auto", "slopbot", "puppet"])
+                    .optional()
+                    .describe("auto (default) picks slopbot for its guilds, the client otherwise"),
                 confirm: z.boolean().optional().describe("Accept the near-limit warning")
             }
         },
-        async ({ channelId, guildId, mode, confirm }) =>
-            jsonText(await media.startScrape({ channelId, guildId: guildId ?? null, mode, confirm }))
+        async ({ channelId, guildId, mode, backend, confirm }) =>
+            jsonText(await media.startScrape({ channelId, guildId: guildId ?? null, mode, backend, confirm }))
     );
 
     server.registerTool(

poc/src/webui.ts

@@ -802,8 +802,11 @@ export function startWebUi(deps: WebUiDeps): WebUiHandle {
             const mode = req.body?.mode === "download" ? "download" : "links";
             const guildId = req.body?.guildId ? String(req.body.guildId) : null;
             const confirm = req.body?.confirm === true;
+            const requested = String(req.body?.backend ?? "auto");
+            const backend =
+                requested === "slopbot" || requested === "puppet" ? requested : "auto";
 
-            const scrape = await deps.media.startScrape({ channelId, guildId, mode, confirm });
+            const scrape = await deps.media.startScrape({ channelId, guildId, mode, confirm, backend });
             deps.getPuppet()?.appendAction({
                 type: "media",
                 action: "scrape",