Node SDK: Handle tool and permission broadcasts via event model#686

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SteveSandersonMS wants to merge 11 commits intomainfrom

stevesa/handle-broadcasts-for-permissions-and-tools

Commits on Mar 5, 2026

Handle tool and permission broadcasts via event model instead of RPC callbacks

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Add multi-client broadcast E2E tests for tools and permissions

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Fix permission test race: client 2 handler never resolves so only client 1 approves

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Add permission rejection test and use codegen'd types for result assertions

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Add E2E tests for per-connection external tool union and disconnect cleanup

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Bump protocol version to 3 and guard fallback RPC calls

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Revert unnecessary nested try/catches in RPC fallback calls

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Support connecting to parent process
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Address PR review feedback

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Add unstable dist tag for NPM package
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Update publish.yml
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