test(statistics): cover the timeline and ignore a start-only timing

[efirvida]

Chain Context

Field	Value
Chain	per-session statistics module (upstream Gentleman-Programming#1583)
Tracker	upstream/statistics-tracker → upstream integration PR Gentleman-Programming#1627 (draft)
Position	11 of 27
Base	upstream/statistics-10-timeline
Depends on	#38
Follow-up	upstream/statistics-11-timeline-tests (slice 12)
Review budget	217 / 400
Starts at	upstream/statistics-10-timeline
Ends with	test(statistics): cover the timeline and ignore a start-only timing

Chain Overview

upstream/main
 └── upstream/statistics-tracker (root, integration PR #1627)
      └── … slices 1..10 … (##38 is the immediate parent)
           └── 📍 upstream/statistics-11-timeline-tests
                └── … slices 12..27 …

Scope

• Includes: test(statistics): cover the timeline and ignore a start-only timing
• Excludes: every other slice. A polluted diff against upstream/statistics-10-timeline is a branching bug, not a scope surprise.

Verification

Focused and affected suites are green on this slice; tests and docs for this unit ship with it.