conformance: create everything-client with basic scenarios and configure GitHub action to run it

- implement all non-auth scenarios (client OAuth is not yet supported)
- sse-retry is also implemented, but failing due to a bug in the SDK
- configure client-conformance job in the conformance GitHub action
- create a client-conformance.sh script and rename conformance.sh to server-conformance.sh

.github/workflows/conformance.yml

@@ -36,3 +36,20 @@ jobs:
           url: http://localhost:3001/mcp
           suite: active
           expected-failures: ./conformance/baseline.yml
+
+  client-conformance:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+      - name: Set up Go
+        uses: actions/setup-go@d35c59abb061a4a6fb18e82ac0862c26744d6ab5 # v5
+        with:
+          go-version: "^1.25"
+      - name: "Run conformance tests" 
+        uses: modelcontextprotocol/conformance@c2f3fdaf781dcd5a862cb0d2f6454c1c210bf0f0 # v0.1.11
+        with:
+          mode: client 
+          command: go run ./conformance/everything-client/main.go
+          suite: core
+          expected-failures: ./conformance/baseline.yml

.github/workflows/nightly.yml

@@ -32,5 +32,5 @@ jobs:
       uses: actions/setup-node@39370e3970a6d050c480ffad4ff0ed4d3fdee5af # v4.1.0
       with:
         node-version: "20"
-    - name: Run conformance tests
-      run: ./scripts/conformance.sh
+    - name: Run server conformance tests
+      run: ./scripts/server-conformance.sh