chore: verify lint compliance

[marcus]

Summary

• verify a fresh branch from main is clean and matches main before validation
• run golangci-lint, go test ./..., and go build ./cmd/nightshift successfully
• document that this task is a verified no-op because main is already lint-compliant

Notes

• No source files changed.
• This PR contains a single empty commit so the no-op verification is reviewable.

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Automated by nightshift