Support native time node

[txbrown]

Parent: #4

Add renderer/native support for Elementary's time node.

Docs: https://www.elementary.audio/docs/reference/time

Scope:

• Confirm how the web/offline renderers represent and schedule time.
• Add any native renderer/runtime bridge support needed on iOS and Android.
• Add or update JS/API coverage if this package needs explicit handling.
• Add example or test coverage proving el.time(...) works in React Native.

Acceptance criteria:

• el.time can be used from the React Native renderer without native/runtime errors.
• Behavior matches Elementary docs closely enough for transport/time-driven graphs.
• Works on both iOS and Android, or documents any platform limitation.