fix(ci): resolve serde_core duplicate alloc in clippy and quick-benchmarks

- Exclude pezkuwi-zombienet-sdk-tests from clippy (nested cargo build
  in build.rs overrides SKIP_WASM_BUILD with empty string, triggering
  wasm32-unknown-unknown + build-std which conflicts with serde_core)
- Use WASM_BUILD_STD=0 for quick-benchmarks to avoid build-std
  (uses pre-built wasm32-unknown-unknown sysroot instead)
- Update CLAUDE.md with correct CI runner VPS info

.github/workflows/checks.yml

@@ -50,7 +50,8 @@ jobs:
         run: |
           git config --global --add safe.directory '*'
           cargo clippy --all-targets --all-features --locked --workspace --quiet \
-            --exclude pezpallet-revive-eth-rpc
+            --exclude pezpallet-revive-eth-rpc \
+            --exclude pezkuwi-zombienet-sdk-tests
 
   check-try-runtime:
     runs-on: ${{ needs.preflight.outputs.RUNNER }}