Verifying the Backtest page: the scrub state panel labelled n_active "active
sleeves", but n_active counts the instruments HELD that day — the Bybit book's
~64-coin liquid universe (compare_measured_cost sets n_active=[n_coins]*len),
the ETF book's ~5 ETFs — NOT the book's sleeves (its 4 edges). So a 4-edge book
read as having "64 sleeves". Relabelled "active positions", accurate for both
the coin book and the ETF book.
Regression test pins "active positions" (and asserts "active sleeves" absent).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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