README: correct coverage to 44 public models, add refresh log

Fixes stale 43-model claims (title sentence and file-layout count) after adding szl-energy-attest; documents the 2026-08-31 additive refresh honestly.

README.md

@@ -15,9 +15,7 @@ Canonical CycloneDX 1.5 Model BOM registry for all 44 public models under the
 ## Provenance
 
 Generated 2026-08-30 by `szl_estate_audit` from live Hugging Face Hub metadata
-(model listings, repository file siblings, and card data). Incremental update
-2026-08-31: added `szl-energy-attest` (created 2026-08-31T01:29:26Z, after the
-initial audit sweep) from live Hub metadata; the other 43 BOMs are unchanged. Each BOM is a
+(model listings, repository file siblings, and card data). Each BOM is a
 pretty-printed CycloneDX 1.5 JSON document carrying a unique `urn:uuid`
 serial number.
 
@@ -44,8 +42,8 @@ serial number.
 `szl:publication_eligible=false` (with `szl:heldout_eval` = "MISSING - required
 before publication") marks a model that is tracked in the estate but **not
 cleared for publication** under SZL doctrine: a held-out evaluation receipt must
-be attached and verified before the flag can flip to `true`. Values reflect Hub state at audit
-time (2026-08-30; `szl-energy-attest` 2026-08-31).
+be attached and verified before the flag can flip to `true`. Values reflect Hub
+state at audit time (2026-08-30).
 
 ## Per-repo copies
 
@@ -54,3 +52,13 @@ repository. Those per-repo writes are additive-only (never overwriting existing
 files) and are currently pending a write-scoped credential for
 `models/SZLHOLDINGS/*`; they will land once that authorization exists. Until
 then, this dataset is the canonical registry of record.
+
+## Refresh log
+
+- 2026-08-31: additive refresh. Added `models/szl-energy-attest.cdx.json` for
+  `SZLHOLDINGS/szl-energy-attest` (created 2026-08-31), bringing coverage to
+  44/44 public models. The new BOM follows the same CycloneDX 1.5 schema
+  (`build_model_bom` 1.0.0 conventions) and was built from live Hub metadata
+  read via the HF connector; the `bom-index.json` `sha256` is over the exact
+  uploaded bytes. The other 43 BOMs are unchanged from the 2026-08-30
+  `szl_estate_audit` generation.