ci: keep the installer MCP stub session from hanging the job

The stdio MCP server answers requests but never exits on stdin EOF, so the
previous pipe blocked the step until the 15m job timeout. Feed the requests
through a pipe held open by a trailing sleep (an immediate EOF closes the
transport before it replies), then kill the process by name. Avoids the
non-portable `timeout` (absent on macOS runners).

Author: mrmx

.github/workflows/installers.yml

@@ -64,12 +64,23 @@ jobs:
           # Exercise the MCP server end-to-end without a backend. This is the
           # real check: a native image missing reflection/serialization metadata
           # starts fine but crashes here (UnsupportedFeatureError / HTTP 0).
+          #
+          # The stdio server answers as messages arrive but never exits on its
+          # own, so: feed the requests through a pipe kept open by a trailing
+          # sleep (an immediate EOF makes it close before replying), then kill
+          # it by name. `timeout` is avoided — macOS runners don't ship it.
           echo "== MCP stub session (initialize + tools/list) =="
-          init='{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"ci","version":"0"}}}'
-          inited='{"jsonrpc":"2.0","method":"notifications/initialized"}'
-          list='{"jsonrpc":"2.0","id":2,"method":"tools/list"}'
-          { printf '%s\n' "$init" "$inited" "$list"; sleep 5; } \
-            | "$BIN" --stub > mcp.out 2> mcp.err || true
+          printf '%s\n' \
+            '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"ci","version":"0"}}}' \
+            '{"jsonrpc":"2.0","method":"notifications/initialized"}' \
+            '{"jsonrpc":"2.0","id":2,"method":"tools/list"}' > session.jsonl
+          ( cat session.jsonl; sleep 6 ) | "$BIN" --stub > mcp.out 2> mcp.err &
+          sleep 9
+          if command -v taskkill >/dev/null 2>&1; then
+            taskkill //F //IM qtsurfer-mcp.exe >/dev/null 2>&1 || true
+          else
+            pkill -f qtsurfer-mcp 2>/dev/null || true
+          fi
           cat mcp.out
           grep -q '"list_exchanges"' mcp.out \
             || { echo "::error::tools/list did not return the expected tools"; cat mcp.err; exit 1; }