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* 📎 Ignore .iml files (IntelliJ module files) * 🎉 Enable multi-instance horizontal scaling for MCP server Allow the MCP server to run as multiple instances behind a plain round-robin load balancer, removing the previous requirement that a user's plugin WebSocket and MCP client connection terminate on the same instance. Behaviour is unchanged when run as a single instance or without Redis. Cross-instance MCP sessions: when a request arrives with an mcp-session-id that was initialised on another instance, the session is adopted locally instead of rejected. The user token is read from the query parameter (present on every request, as the configured endpoint URL is never rewritten), so no shared session store is needed; the transport is pre-initialised so the SDK's validateSession() accepts it. Cross-instance task routing: when a Redis URI is configured in multi-user mode, plugin task requests are routed via Redis pub/sub keyed by user token. The instance holding a plugin's WebSocket subscribes to that token's request channel; any instance handling a tool call publishes the request and awaits the response on a per-request channel. RedisBridge is a pure transport for the existing serialised PluginTaskRequest/Response objects. PluginTask is split into an abstract base plus a local (promise-backed) PluginTask and a RemotePluginTask whose resolve/reject publish the outcome back over Redis, so the existing local dispatch and response-correlation paths are reused unchanged on the executing instance. Refs #10000