[codex] fix warnings across targets

[bobzhang]

Summary

• remove deprecated syntax and lint warnings across native, js, and wasm codepaths
• add explicit wasm websocket stubs so all-target builds compile cleanly
• refresh generated .mbti files after moon info

Why

• the module had deprecation warnings on the default target, and moon check --target all also exposed wasm-only warnings and missing symbols

Impact

• moon check --target all is now clean
• unsupported wasm websocket/fetch paths now fail explicitly instead of relying on missing symbols
• no intended public API changes beyond regenerated interface output formatting

Validation

• moon check --target all
• moon test --target all
• moon info
• moon fmt

Review

• a fresh Codex review pass found no actionable findings after the wasm fetch follow-up fix