Decorator implementing IAuditLog that auto-populates AuditEntry.correlationId
from the active OTel span via currentTraceId(). Caller-supplied correlationId
always wins (explicit > implicit). eraseSubject passes through unmodified.
Adds @opentelemetry/{api,sdk-trace-base,context-async-hooks} as devDeps for
test infrastructure.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
