Phase 54: exhaustive re-adjudication complete (zero survivors); CV settles - exact leave-one-building-out, single value, champion 1877.3

EXPERIMENTS.md

@@ -2853,3 +2853,47 @@ under the deployment-shaped instruments.** Champion 3c7b883 / current head
 (static @ 0.8, cert and pooling off) stands. Endgame per the user's mechanics
 (private = user-selected past versions): score the current head publicly; if
 ~1661, select the head for private (robustness-hardened); else select 3c7b883.
+
+## Phase 54 - full re-adjudication complete + the CV settles (user-driven)
+
+### (a) The exhaustive re-try of every rejected idea (user directive)
+
+10-agent sweep over the entire EXPERIMENTS.md candidate history on the
+then-current instrument pair, base reproduced at 1661.65 in every arm.
+All planners (14 arms, +343..+954, all REJECT), all model families (4 slices,
+~50 arms, zero ALIVE - logbag==logistic now confirmed on four instruments),
+all feature re-adds (calendar/vproj/ranks/fht_days/temp30/dbz/stale2 -
+REJECT; temp_mean upgraded from 'absorbed' to actively harmful +54.5),
+timing target days-to-crossing (+35.2 REJECT, with the label-process
+refinement that the administrative EOL is stamped ~AT the confirmation day,
+not +3d after), and the 87-config timing-knob grid whose single nominal
+survivor cfg59 (ec_margin 0.6 / emergency_day 48, -6.61 +/- 3.10, 6W/0L/42T)
+was killed on the building-OOF surface (+14.97 +/- 22.05) - textbook
+best-of-87 selection noise with the cert-first W/T profile. The peer session's
+parallel building-OOF candidate sweep confirmed 23 of 24 rejections and
+parked its one coin-flip survivor (rankavg25fht: wf-OOF panel -48.6 at
+17W/16L, self-fit +17.8 with catches -2, static multi-seed never run).
+
+### (b) THE SCORE - the CV settles (user decisions, in order)
+
+1. Building split is the score, always (not the self-fit 1661.7).
+2. Foreign buildings' FULL history (before and after the origin) is legal
+   training data - deployment itself hands the model future-of-origin
+   foreign-building knowledge, and it removes the cold-start distortion.
+3. Per-building planning (cv lobo) was specified, built, and superseded the
+   same day: it breaks the count rule by construction (129 zero-swap-death
+   building-scenarios, recall 0.367 vs 0.542; per-device thresholds fix the
+   recall - 0.766 at p*=0.10 - confirming the break was count granularity,
+   not prediction). Kept as a diagnostic.
+4. Final protocol: EXACT leave-one-building-out predictions (24 models, each
+   trained on the other 23 buildings' full closed history), ONE full-fleet
+   plan per scenario, single value = ALL-48 mean.
+
+**Champion on the final CV: `cv all48oof` SCORE = 1877.3** (72 s per run;
+5-fold approximation was 1913.3; panel 1857.7). Reference chain for level
+sanity: self-fit 1661.7 < exact-LOBO 1877.3 < 5-fold-OOF 1913.3 - more
+foreign training data helps, self-building identity flatters by ~200.
+
+Everything is judged against 1877.3 paired per scenario from here, sched-flat
+rule in force. Public best remains 3c7b883 at 1661.45; private selection
+recommendation unchanged (score the hardened head publicly, then select).