noita-player 4d0782db68 MCP bridge: support multiple concurrent clients ...

Replace single-client model (m_client/m_readBuffer/m_initialized)
with a ClientState vector. Each client gets its own read buffer and
initialized flag. Responses route to m_currentSender (set during
request processing); notifications broadcast to all initialized
clients.

Re-entrancy guard in onReadyRead: re-resolve ClientState after each
processLine() call since sendJson flush can re-enter the event loop
and trigger onDisconnected, removing the client mid-iteration.

Tests: 378-line test_mcp exercising connect, initialize, tools/list,
disconnect one client, notification broadcast, and serial requests
against a MockMcpServer with the same multi-client architecture.

2026-03-08 22:44:47 -07:00

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