quantmodel — Port + verify Piard Annual Seasonality vs AS metrics

Objective

Port + verify Piard Annual Seasonality vs AS metrics.

Notes: Piard Annual Seasonality replicated 2015+: corr 0.9998 CAGRΔ +0.26%. Spec/backtest/piard_seasonality.py + runner. Findings: piard-annual-seasonality-scale-batch.md.

Approach

Reuses existing report research/findings/piard-annual-seasonality-scale-batch.md — tables/metrics preserved verbatim via source_report pointer. Body below summarizes grounded evidence from that report and adjacent artifacts.

Files / code / data changed

Associated commits (inferred from log grep t57):

6469954b research: t57 Piard Annual Seasonality replicated vs AS (#54)
6469954b research: t57 Piard Annual Seasonality replicated vs AS (#54)
Source report: research/findings/piard-annual-seasonality-scale-batch.md
Task-history entry: research/findings/task-history.json#t57

Results

Key table from source report (preserved):

id	corr (2015+)	overlap CAGRΔ	gate
piard-annual-seasonality	0.9998	+0.26%	replicated

Conclusions and metrics are in research/findings/piard-annual-seasonality-scale-batch.md; see detail page for preserved tables/metrics.

Conclusions

Piard Annual Seasonality replicated 2015+: corr 0.9998 CAGRΔ +0.26%. Spec/backtest/piard_seasonality.py + runner. Findings: piard-annual-seasonality-scale-batch.md.

Problems / follow-ups

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