builtbykev
092f8f09cd
Build opportunity_drift axis on challengerProjection (arch-v1)
...
Champion p_win and the live grade path are BYTE-IDENTICAL: the axis writes
only to p_win_challenger / challenger_adjustments in the ledger.
STEP 1 -- MAP THE INPUT. MLB_LOG_FIELD now maps at_bats -> 'atBats'.
Deliberately NOT added to outcomeService's map or liveTracking's
LIVE_BOX_FIELD: those exist to SETTLE and TRACK graded props, and nothing
grades at-bats, so adding it there would imply a settlement path for a
market we do not carry. A test asserts the settle map still lacks it.
STEP 2 -- DRIFT, NOT LEVEL. opportunity_drift = mean(last-5 atBats) /
(season atBats / games). The LEVEL is collinear with l20_avg (same
games denominator; hits/game ~= (hits/AB) x (AB/game)), so the projection
already embeds it multiplicatively and adding it would double-count. A
deviation from the player's own baseline is the part the projection does
not contain.
HONEST ABSENCE throughout: fewer than 3 at-bat rows, no at-bats in the
logs, or no season baseline all leave drift UNDEFINED -- never 1.0 by
default and never 0. Number(null) === 0 here would read as "zero at-bats",
the strongest possible fade, invented from missing data. Four tests cover
the absent paths.
STEP 3 -- THE AXIS. opportunityNudge composes in the same log-odds space
as park and platoon (log of a ratio), with two guards the measured axes do
not need: a +/-10% DEADBAND (a rest day or a blowout can move a 5-game
window without any role change) and a tighter cap (0.15 vs the
environment's 0.30) so a noisy PROXY cannot outvote measured signals.
Every adjustment carries is_proxy: true and
proxy_for: 'confirmed_batting_order' so nothing downstream can mistake it
for a lineup feed.
The axis can stand ALONE -- without it the early return would gate
opportunity off on exactly the thin-classification rows it is most likely
to help.
Zero extra I/O: analyzeViaEngine1 attaches drift from the feature vector
it has already built, and attachChallenger reads it off the grade. Nothing
re-fetches in a loop that runs over hundreds of props.
COLLINEARITY GUARD added to the coverage probe: Pearson r of drift against
l20_avg / l5_avg / ab_per_game, returning null under n=8 rather than
reporting a correlation on a handful of rows. If drift just re-encodes the
projection, the axis is dead signal and gets shelved.
Gates: 4,073 tests / 326 suites green; next build exit 0.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com >
Claude-Session: https://claude.ai/code/session_01QJs13VsyiSKYQP6rj3NNmc
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