[pacocartones]

Summary

• interpret days on overnight peak-hour windows as the UTC day on which the window starts
• keep the post-midnight segment protected until its exclusive end boundary
• preserve daytime and unrestricted daily-window behavior

Related Issues

• Follow-up to feat: Customizable peak hour protection #11622

Validation

⚠️ base-red inherited: #11449

• Change type: provider
• Focused tests and category gates from the golden path
• npm run lint — inherited stale-suppressions failure reproduced on the clean base (#11600); changed-file ESLint passes
• Reconciled with the current active release base; focused checks rerun afterward
• Production-code changes include an updated automated test in this PR

Focused evidence:

• TDD RED: a Monday-only 22:00–02:00 window returned inactive on Tuesday at 01:00Z
• tests/unit/peak-hour-protection.test.ts: 5/5 pass
• npm run typecheck:core: pass
• changed-file ESLint, Prettier and git diff --check: pass
• independent review: pass

Tests Added Or Updated

• tests/unit/peak-hour-protection.test.ts

Coverage Notes

• Covers the start-day segment, the after-midnight segment, exclusive end boundary, a disallowed following night, Tuesday-only non-match, Sunday-to-Monday rollover and daily overnight behavior.

Reviewer Notes

• All calculations remain UTC-only; subtracting one UTC day is not exposed to local DST transitions.
• The draft is used only to allocate the real PR number for the required numbered changelog fragment and will be marked ready immediately afterward.