Adds the afterRead hook factory for per-collection opt-in automatic VIEW
audit entry emission. Fire-and-forget design ensures failing sinks never
propagate to the user-facing read. Includes sentinel IP/UA fallbacks,
truncateIp /24 integration, shouldSkip predicate, and system actor
resolution. All 6 TDD test cases pass; both barrels updated.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
