R12 SD-CST Joint Renderer Compiler Post-Hoc Audit
Status: completed; exact report preserved
Job / node / elapsed: 694110 / H100 evc27 / 10m44s
Report SHA-256:
318b64584b3c1852a9e16025755b0595c0e78dc853411e466218540cd4f66b68
Purpose: distinguish dead optimization from cascading record-address errors after the preregistered joint control failed complete-record gates
This is an explicitly post-hoc diagnostic over the already-consumed renderer orbit. It is not a score, a model-selection gate, or a reasoning claim. It may read only the consumed training rows, exact rejected orbit checkpoint, and exact rejected joint checkpoint. Development and confirmation are unreachable.
The audit reports per-slot rather than all-slots-at-once exactness for line address, event address, kind, amount, and identity at exact initialization and the rejected endpoint. Two model-state interventions are diagnostic only:
- uniform pooling over the gold source-line span before the unchanged native slot decoder, measuring kind and amount; and
- uniform pooling over the gold event-name span before the unchanged frozen fingerprint matcher, measuring identity.
These interventions cannot establish capability. They localize whether errors come from line addressing, event addressing, or downstream field readout. The complete deployed system remains 179,826,564 parameters, strictly below 200M. No training, rescore, threshold, development read, or confirmation read is authorized by this audit.
Exact Result
Aggregate rates across all four held-out renderer combinations are:
| Field | Exact initialization | Rejected endpoint | Delta |
|---|---|---|---|
| Physical source-line address per slot | 10.896% | 42.029% | +31.133 pp |
| Event-name address per active slot | 6.555% | 25.466% | +18.911 pp |
| Event kind per slot | 40.719% | 55.731% | +15.013 pp |
| Amount per active slot | 49.836% | 68.000% | +18.164 pp |
| Identity per active slot | 41.168% | 50.325% | +9.157 pp |
The endpoint's fit rates are 42.030%/25.468%/55.796%/68.242%/50.135% in the same order. Fit and held-out behavior are therefore nearly identical; the failure is not orbit-combination overfitting.
At the endpoint, uniform pooling over the gold source line raises held-out kind from 55.731% to 73.641%, but changes amount only from 68.000% to 68.134%. Uniform pooling over the gold event-name span raises identity from 50.325% to exactly 100% over all 56,000 held-out active slots. Thus the frozen fingerprint matcher and declaration binding are sufficient once the event address is correct. Line localization explains part, but not all, of kind error; amount requires better local field extraction rather than only a better line pointer.
Decision
The audit closes dead-gradient and renderer-overfit explanations. It supports a distinct factorization: independently encode delimiter-bounded physical records, predict their local fields, then perform model-logit-only one-to-one record assignment into the categorical tape. Merely widening, deepening, or extending the failed independent global-query path remains forbidden.
Exact evidence is committed at
artifacts/r12/sd_cst_renderer_native_joint_audit_219fd41/report.json.