Adds apps/cms/instrumentation.ts (server-only — Payload admin client DSN
is out-of-scope per spec §8). Wraps the Payload-wrapped next config with
withSentryConfig. Adds the R38 PII scrubber test. Required adding
@repo/core-shared as a direct dep of cms (was only transitive before).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
