quantmodel — Extend TLT history (top unproxied limiter; ~47 strategies)

Objective

Extend TLT history (top unproxied limiter; ~47 strategies).

Notes: TLT←VUSTX default (corr 0.991, 1986+); pre1980 DGS20/20y CM TR (corr 0.986). Free Yahoo — no email. Findings: tlt-history-t158.md

Approach

Reuses existing report research/findings/tlt-history-t158.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 t158):

c619e97e research: t158 TLT←VUSTX history proxy + DGS20 CM (#162)
642b121c research: t169 handoff — Windmill live, next t158 TLT (#156)
c619e97e research: t158 TLT←VUSTX history proxy + DGS20 CM (#162)
Source report: research/findings/tlt-history-t158.md
Task-history entry: research/findings/task-history.json#t158

Results

Key table from source report (preserved):

Layer	Source	Start	Monthly corr
Live	TLT	2002-07-30	—
Single-hop default	VUSTX (Vanguard LT Treasury)	1986-05-19	vs TLT 0.991 (n=269)
`pre1980` CM TR	FRED DGS20, maturity=20y	~1962	vs TLT 0.986; vs VUSTX ~0.964

Conclusions and metrics are in research/findings/tlt-history-t158.md; see detail page for preserved tables/metrics.

Conclusions

TLT←VUSTX default (corr 0.991, 1986+); pre1980 DGS20/20y CM TR (corr 0.986). Free Yahoo — no email. Findings: tlt-history-t158.md

Problems / follow-ups

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