Report Service with a Seamed Clock

Combine Module 8's seams with Module 12's layering in Solution: - interface Clock { long nowMillis(); } (reuse the shape) - static class ReportService with constructor (Clock clock) exposing String header() returning "Report @ <millis>" using the injected clock. - static class ReportController with constructor (ReportService s) exposing String render() returning s.header() + "\n[body]". Build the graph twice with different clocks — proving the controller is agnostic to time. This is the composition root skill.

Difficulty: intermediate