Add `props` to ExecutionContext for Hono/CF compatibility

[max-lt]

Problem

When using Hono with OpenWorkers, there's a type error because Hono's ExecutionContext expects a props property that OpenWorkers' type doesn't have:

error TS2345: Argument of type 'ExecutionContext' is not assignable to parameter of type 'ExecutionContext'.
  Property 'props' is missing in type 'ExecutionContext' but required in type 'ExecutionContext'.

Current workaround

ctx: ExecutionContext & { props: never }

Proposed fix

Add props to ExecutionContext in types/workers.d.ts:

interface ExecutionContext {
  waitUntil(promise: Promise<unknown>): void;
  passThroughOnException(): void;
  props: unknown;  // For Hono/Cloudflare Workers compatibility
}

This would make OpenWorkers types a drop-in replacement for CF Workers types when using Hono.