Support nested object graph access in Remote types

[KirtiRamchandani]

Fixes #680.

Problem

RemoteProperty<T> currently types unmarked object properties only as Promise<T>. At runtime, those properties can also be traversed as remote proxy paths, so proxy.service.method() works but TypeScript rejects it.

Root cause

The conditional type collapses every non-function, non-ProxyMarked property to Promisify<T>, which loses the nested remote object surface.

Solution

For object properties, expose an intersection of Remote<T> and Promise<T>. This keeps await proxy.service typed as the cloned object while also typing proxy.service.method() and other nested proxy-path access.

Tests

• npm run test:types
• npm run build
• npm run test:node
• npx prettier --check src/comlink.ts tests/type-checks.ts
• git diff --check