fix(node): make hono an optional peer dependency

.changeset/hono-peer-optional.md

@@ -0,0 +1,5 @@
+---
+'@modelcontextprotocol/node': patch
+---
+
+Mark `hono` peer dependency as optional. `@modelcontextprotocol/node` only uses `getRequestListener` from `@hono/node-server` (Node HTTP ↔ Web Standard conversion), which does not require the `hono` framework at runtime. Consumers no longer need to install `hono` to use `NodeStreamableHTTPServerTransport`. Note: `@hono/node-server` itself still declares `hono` as a hard peer, so package managers may emit a warning; this is upstream and harmless for `getRequestListener`-only usage.

packages/middleware/node/package.json

@@ -49,6 +49,11 @@
         "@modelcontextprotocol/server": "workspace:^",
         "hono": "catalog:runtimeServerOnly"
     },
+    "peerDependenciesMeta": {
+        "hono": {
+            "optional": true
+        }
+    },
     "devDependencies": {
         "@modelcontextprotocol/server": "workspace:^",
         "@modelcontextprotocol/core": "workspace:^",