The closing proof: a GER40 campaign with a constant+vol_slippage cost
block runs to exit 0; every member's net_expectancy_r < expectancy_r
(costs bite), the same doc without the cost block reproduces today's
exact gross numbers (golden parity), net_r_equity.json persists on
request, and the costed family reproduces bit-identically. One plan
literal corrected in place: the member-line filter exact-matches the
line shape so the campaign_run summary record (which nests a family_id)
no longer false-matches.
Verified: e2e green on the real archive, full workspace suite green,
clippy -D warnings clean.
closes#234
Brummel
c32c01a63c