Add custom event remote session proto

[toubatbrian]

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[chatgpt-codex-connector]

Validate custom-event payload before Struct conversion

dictToStruct() passes Record<string, unknown> directly into Struct.fromJson(), but this API only accepts JSON-compatible values. Because the new public payload type permits non-JSON data (for example { foo: undefined }, Date, bigint, or functions), emitting a custom event can throw synchronously in onCustomEvent, which can break event forwarding for the session at runtime. Tightening the type to a JSON object (or sanitizing/rejecting unsupported values before conversion) avoids this runtime failure mode.

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