tests: fix tests

[lecaros]

Fix broken test suite

The test suite was failing for two reasons: it couldn't build on Apple Silicon, and the golden outputs were out of date and non-reproducible after the gofakeit v6 upgrade.

Changes:

• Removed the bou.ke/monkey dependency (amd64-only, blocked tests from building on ARM). It was only used to freeze time.Now in tests — the generators already accept a timestamp parameter, so tests now pass the fixed time directly.
• Made test output deterministic again by seeding gofakeit's global faker (gofakeit.Seed(11)) in addition to math/rand. Since v6, gofakeit uses its own randomly-seeded source, so seeding math/rand alone no longer produced stable output.
• Regenerated all golden // Output: blocks to match the current gofakeit version.
• Updated CLAUDE.md test notes accordingly.

go test ./... now passes on both arm64 and amd64, and go vet is clean. No changes to the CLI or generated log formats.