Extends bind-production.test.ts with a vi.mock for @repo/core-shared/instrumentation
that wraps bindSentryInstrumentation and bindNoopInstrumentation in vi.fn (so call
counts are observable while real implementations still run). Adds 4 orthogonality
tests covering: DSN absent + production env, DSN set + dev env, Sentry + dev seed,
Noop + production — verifying instrumentation choice is independent of repo mode.
Total: 6 original + 4 new = 10 passing tests.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>