adjust fallback-week calculation to avoid incomplete weeks

[drewda]

No description provided.

[Copilot]

Pull Request Overview

Improves fallback week selection logic to prioritize weeks with service on all days of the week over partial weeks that may have zero service on certain days. This addresses an issue where weeks with incomplete service patterns (e.g., no Monday/Tuesday service) were being selected as fallback weeks.

• Modified fallback week selection to use a two-pass algorithm that first seeks weeks with full service, then falls back to highest total service if none exist
• Added comprehensive test coverage for various edge cases including partial weeks, complete zero-service weeks, and reduced service scenarios

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
internal/clock/swcache.go	Implements two-pass fallback week selection algorithm with individual day service checks
internal/clock/swcache_test.go	Comprehensive test suite covering edge cases for fallback week selection logic

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