Update the tests README for Ruby server coverage

The README still said the Ruby weather server was uncovered and described
the resultType gap as unfixable from an example. Both stopped being true
when the server test landed.

Also move the no-API-key comment below the Ruby server test. It describes
the client tests, and sat where it read as describing the server one.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: olaservo

tests/README.md

@@ -6,13 +6,11 @@ This directory contains smoke tests for the MCP quickstart examples. These tests
 
 The smoke tests verify:
 
-- **Servers**: Each weather server (Python, TypeScript, Rust, Go) can start, respond to MCP protocol requests, and honour the output schemas it advertises
+- **Servers**: Each weather server (Python, TypeScript, Rust, Go, Ruby) can start, respond to MCP protocol requests, and honour the output schemas it advertises
 - **Clients**: The Python, TypeScript and Ruby MCP clients can connect to a mock server and list tools
 
 The Go and Rust clients are not covered here: on `main` both abort when no `.env` file is present, so they cannot be driven without credentials. Making them start credential-free is a change in their own directories, so their coverage lands with those changes rather than here.
 
-The Ruby **weather server** is not covered, for an upstream reason rather than a local one. The `mcp` gem negotiates `2026-07-28`, but its server never emits the `resultType` field that revision makes mandatory, so the test client rejects its responses — including `tools/list`. That is a fix for the gem, not something an example can work around. The Ruby **client** is covered: there it is the gem's client code that runs, and the server it is pointed at is the mock.
-
 ## Structured content
 
 Listing tools is not enough to catch a broken structured result, so each server test also **calls** every tool that declares an `outputSchema` and checks the answer:

tests/smoke-test.sh

@@ -84,10 +84,6 @@ test_weather_server_go() {
     node "${TEST_CLIENT}" "${server_bin}"
 }
 
-# The client tests drive the no-API-key path, where each client prints a notice
-# and exits. Empty rather than unset: dotenv skips a name already present in
-# ENV, so a key in the environment or a local .env would start the chat loop.
-
 # Test: Ruby weather server
 test_weather_server_ruby() {
     check_dependency ruby || return 1
@@ -97,6 +93,10 @@ test_weather_server_ruby() {
     (cd "${server_dir}" && node "${TEST_CLIENT}" bundle exec ruby weather.rb)
 }
 
+# The client tests drive the no-API-key path, where each client prints a notice
+# and exits. Empty rather than unset: dotenv skips a name already present in
+# ENV, so a key in the environment or a local .env would start the chat loop.
+
 # Test: Python MCP client
 test_mcp_client_python() {
     check_dependency uv || return 1