document CTT proxy gate diagnostics

README.md

@@ -259,12 +259,15 @@ CTT training/proxy/rollout:
 
 - `scripts/train_ctt.py`: trains residual or gated residual CTT.
 - `scripts/eval_ctt_proxy.py`: proxy support evaluation with PPTC,
-  NegativeNear, distance, diversity, and collapse metrics.
+  NegativeNear, PosCloserThanNeg, distance, diversity, and collapse metrics.
+  Use `--no-markdown-report` for README-only runs.
 - `scripts/eval_ctt_generated_rollout.py`: measured rollout harness that
   restores states, decodes generated tangents, executes candidates, and writes
   measured candidate rows.
 - `scripts/eval_ctt_rollout.py`: measured-output wrapper.
-- `scripts/build_ctt_proxy_comparison.py`: proxy comparison/gate table.
+- `scripts/build_ctt_proxy_comparison.py`: proxy comparison/gate table with
+  by-task/by-seed JSON outputs. Use `--no-markdown-report` for README-only
+  runs.
 - `scripts/build_ctt_rollout_comparison.py`: measured rollout aggregation.
 - `scripts/summarize_ctt_runs.py`: global CSV/Markdown summary. Markdown output
   may be generated transiently, but the persistent overview is this README.
@@ -412,6 +415,7 @@ High-value run directories:
 - `runs/ctt_gated_residual_full_seed{0,1,2}`: full gated residual CTT training.
 - `runs/ctt_base_context_obs_test_envclip_k16_rollout_comparison`: current
   strongest measured support artifact.
+- `runs/ctt_val_proxy_comparison`: CTT-vs-local-atlas proxy support gate.
 - `runs/ctt_base_context_obs_train_cal_envclip_k16_rollout_comparison`: train
   calibration rows for K=16 `env_clip`.
 - `runs/ctt_base_context_obs_dominance_envclip_k16_train_to_test`: K=16 LCB
@@ -496,6 +500,29 @@ Key held-out test values:
 
 Interpretation: support is strong; selector is not.
 
+### CTT validation proxy support gate
+
+Run:
+
+```text
+runs/ctt_val_proxy_comparison
+```
+
+This is a proxy geometry gate, not rollout success. CTT variants pass by
+improving mean distance to target positives while staying within the
+NegativeNear@0.20 safety slack; they do not beat local-atlas on PPTC thresholds.
+The gated residual variant fails the safety gate.
+
+| Method | PPTC@0.20 | PPTC@0.40 | Neg@0.20 | Pos<Neg | MeanPos | Collapse | Gate |
+| --- | ---: | ---: | ---: | ---: | ---: | ---: | --- |
+| local-atlas | 0.4058 | 0.6812 | 0.0368 | 0.5998 | 0.7203 | 0.0661 | baseline |
+| CTT residual full | 0.1981 | 0.6087 | 0.0296 | 0.7352 | 0.4509 | 0.0681 | pass |
+| CTT residual base+context+obs | 0.2464 | 0.6425 | 0.0343 | 0.7717 | 0.4347 | 0.0681 | pass |
+| CTT gated residual full | 0.2319 | 0.6135 | 0.0527 | 0.7248 | 0.4337 | 0.0681 | fail |
+
+Interpretation: CTT improves support distance geometry, but the story is still
+diagnostic until measured rollout and selection close the outcome gap.
+
 ### Best current K=16 train-clean learned selector
 
 Run: