feat(data)!: preload flag for AsyncDataService.createLazy

[kunalkindra]

What

createLazy now takes a single object argument and gains an optional preload flag:

AsyncDataService.createLazy({
  load,              // () => Promise<Service>  (may take args)
  properties,        // per-property descriptors
  preload?: boolean, // default false
});

When preload: true, the service is warmed at browser idle via requestIdleCallback instead of waiting for the first property access — so the first real send / read / call never races a cold load. Defaults to false; it is a no-op where requestIdleCallback is unavailable (SSR / Node / older browsers), degrading to the existing lazy-on-first-touch behavior.

Why

A lazy service loads only on first property access. That keeps heavy imports out of the initial bundle, but the first touch pays for the load — and if that touch happens right before the page tears down (e.g. an analytics event fired immediately before a navigation), the load can lose the race and the call is dropped. preload: true closes that window without giving up laziness.

Breaking change

The signature changed from positional createLazy(load, properties) to a single object createLazy({ load, properties, preload? }). Every existing call site must migrate:

// before
createLazy(load, { data: 'observe', fetch: 'fn:promise' });

// after
createLazy({ load, properties: { data: 'observe', fetch: 'fn:promise' } });

Tests / docs

• All internal call sites migrated (create-lazy.test.ts, example.ts); the @ts-expect-error type-safety tests are preserved.
• New tests: preload unset performs no eager load; preload: true warms the service before any property touch and dedupes with the first real access.
• Updated create-lazy.md and the async-data-service README to the object form.
• typecheck, lint, and the full data-package suite (2963 tests) pass.

Also included

A docs(data) commit adds a Corporate contributors section to the root README documenting how to contribute from a personal GitHub identity (SSH host aliases with IdentitiesOnly) when a corporate/EMU account can't fork or push — requested during review.

[krisnye]

LGTM