Code-quality review nits: IEventBus.subscribe docstring said "debug
tag" but InMemoryEventBus actually ignores the param entirely. Also
add a comment to InMemoryEventBus.publish noting that under failFast
only the first rejection rethrows; other failures are intentionally
dropped.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
TDD: red (test-only), then green. InMemoryEventBus validates payloads via
descriptor.schema before fanout, delivers to all handlers via Promise.allSettled,
swallows handler errors by default, and rethrows first error when failFast:true.
5 new tests (8 total passing).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
