mcp: Implement `subscrptions/listen` rpc (SEP-2575)#1007

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guglielmoc/SEP-2575_subscriptions_listen

Commits on Jun 11, 2026

feat: implement subscriptions/listen with SSE support for long-lived streams and end-to-end testing
guglielmo-san
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refactor: remove subscription-based notification tests and cleanup unused imports
guglielmo-san
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Commits on Jun 12, 2026