stream Redstone replies via sendMessageDraft + fix self-killing server_down

Two related changes to how Redstone behaves in chat.

Streaming: replies now animate word-by-word into Telegram using the new
sendMessageDraft endpoint (Bot API 9.5, March 2026) via the @grammyjs/stream
plugin, with @grammyjs/auto-retry on the API layer to swallow 429s
transparently. The previous editMessageText-based approach is gone —
sendMessageDraft is designed for this and animates natively on the client
without hitting the 1/sec-per-chat edit limit. Pace lives in
STREAM_WORD_DELAY_MS=50; tunable in one spot.

server_down footgun: the MCP tool was running `compose down` with no
service arg, which tore down the whole project — including the bot
container running the tool call, which then got SIGTERM mid-conversation
and didn't come back (unless-stopped doesn't restart on a clean compose
down). Behaviour now matches the existing /stop slash command:
compose stop minecraft autossh, leaving the bot up. Pass an explicit
service to stop just that one.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

mcp/lib/minecraft-tools.ts

@@ -49,10 +49,15 @@ export const minecraftTools: Tool<z.ZodRawShape>[] = [
   tool({
     name: "server_down",
     title: "Stop services",
-    description: "docker compose down. Pass a service to stop just one (uses `stop` instead of `down`).",
+    description: "Stop the minecraft + autossh services. The bot container is left running on purpose — a full `compose down` would shut the bot off mid-conversation. Pass a specific service to stop just that one.",
     parameters: { service: z.string().optional() },
     handler: async ({ service }, { mc }) => {
-      const r = service ? await mc.compose("stop", service) : await mc.compose("down");
+      // Without a service arg, stop only minecraft + autossh and leave the bot
+      // running. `compose down` would tear down everything including the bot,
+      // which kills the very process executing this tool call.
+      const r = service
+        ? await mc.compose("stop", service)
+        : await mc.compose("stop", mc.config.serverSvc, mc.config.pfSvc);
       return { ok: r.ok, code: r.code, output: [r.out, r.err].filter(Boolean).join("\n").trim() || "(no output)" };
     },
   }),