quantmodel — Port + verify Link GGC Enhanced Mid-Month vs AS metrics

Objective

Port + verify Link GGC Enhanced Mid-Month vs AS metrics.

Notes: GGC Enhanced Mid-Month replicated 2015+: corr 0.891 CAGRΔ +1.30%. Spec/runner for LinkGGCEnhanced.enhanced_mid_month(); Findings: link-ggc-enhanced-mid-month-scale-batch.md.

Approach

Reuses existing report research/findings/link-ggc-enhanced-mid-month-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 t42):

e1a6ea11 research: t42 Link GGC Enhanced Mid-Month replicated (#40)
e1a6ea11 research: t42 Link GGC Enhanced Mid-Month replicated (#40)
Source report: research/findings/link-ggc-enhanced-mid-month-scale-batch.md
Task-history entry: research/findings/task-history.json#t42

Results

Key table from source report (preserved):

id	monthly corr	overlap CAGRΔ	status
link-ggc-enhanced-mid-month	0.891 → 0.908 (t66)	+1.30% → +0.84%	replicated

Conclusions and metrics are in research/findings/link-ggc-enhanced-mid-month-scale-batch.md; see detail page for preserved tables/metrics.

Conclusions

GGC Enhanced Mid-Month replicated 2015+: corr 0.891 CAGRΔ +1.30%. Spec/runner for LinkGGCEnhanced.enhanced_mid_month(); Findings: link-ggc-enhanced-mid-month-scale-batch.md.

Problems / follow-ups

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