quantmodel — Browser-validate comparison calendar-year returns

Objective

Browser-validate comparison calendar-year returns.

Notes: Chromium validated 2009–2025 values/order, wide/narrow overflow, no-complete-year messaging, and invalid/error cleanup; no product change needed.

Approach

Reuses existing report research/findings/comparison-calendar-validation-t238.md — tables/metrics preserved verbatim via source_report pointer. Body below summarizes grounded evidence from that report and adjacent artifacts.

Files / code / data changed

No commit SHA confidently associated with t238 in sampled log [reconstructed — uncertain].
Source report: research/findings/comparison-calendar-validation-t238.md
Task-history entry: research/findings/task-history.json#t238

Results

Conclusions and metrics are in research/findings/comparison-calendar-validation-t238.md; see detail page for preserved tables/metrics.

Conclusions

[reconstructed — uncertain] Outcome inferred from status done and task note.

Problems / follow-ups

See source report or PR discussion for follow-ups. No unsupported follow-ups fabricated.