palcarazm / component-lifecycle / 24313597690

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feat: make lifecycle hooks async with cancellation support

Convert all lifecycle hooks (doInit, doAttach, doDispose, doDestroy)
from synchronous void to async Promise<{ cancelled: boolean,
reason?: string }> to enable asynchronous validation and operations.

Changes:
- transitionTo() now async and awaits hook results before state change
- Hooks returning { cancelled: true } prevent state transition and
  event emission
- Errors in hooks propagate and fail the transition
- Public methods (init, attach, dispose, destroy) now async: Promise<void>
- Full test coverage for cancellation and error propagation paths

Breaking change: All lifecycle methods now return Promise requiring
await at call sites.

Implements #9

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