fix(server): complete empty listen subscriptions

[SoulmatelynchVFX]

Fixes #2650.\n\n## Summary\n- acknowledge and immediately complete subscriptions/listen when no requested notifications are honored\n- avoid creating a bus subscription or keep-alive timer for a stream that cannot deliver events\n- add a regression test for the empty-honored-filter lifecycle\n\n## Tests\n- �itest run test/server/createMcpHandlerListen.test.ts\n- Server typecheck\n- Prettier and ESLint for the changed source

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