Updates CLAUDE.md

CLAUDE.md

@@ -8,6 +8,22 @@ Context for continuing work on this dataset. Captures the design decisions and c
 
 Default to embedding snapshots over relying on cross-joins — consumers training models should be able to load this one config and have everything they need on each row.
 
+## Open notes (as of 2026-06-24)
+
+The dataset grew faster than the docs. Some of the architectural claims below
+are now drifting from reality — flagging here so future-you doesn't trust
+this file uncritically.
+
+- **Specimen counts in the README and "Current state" section below are stale.** Real counts as of 2026-06-24: **38 D638 + 32 D790 = 70 specimens**, across 9 scripts. Includes a new PA12GF_FL Formlabs PA12 GF control series (5 tensile + 5 flex, from `2026_06_16/`). The README configs table still claims `22 SLS + 3 PLA + 3 PETG = 28` for D638.
+- **`batch_label` no longer cleanly identifies a print run.** Batch D (5 D638, tested 6/08) and Batch E (5 D638, tested 6/10) come from the **same** 2026-06-07 print job — so `batch_label` is now closer to "test cohort" than "print batch identity". This contradicts the architectural decision below. Pick a side: either rename to `test_cohort` and update docs, or split E off and use a different scheme to encode "tested twice from same print".
+- **Missing flex script for 2026-06-08.** `source/2026_06_08/TST2.Test/` has 6 TestRun folders + `flex_testing_6.8.xlsx`, but only the TST1.Test tensile side is wired up in `04_2026_06_08_tensile.py`. Needs a paired `04_2026_06_08_flex.py` (or similar).
+- **Numbering collision in `scripts/specimens/`.** Two scripts share the `04_` prefix (`04_2026_06_08_tensile.py` and `04_2026_06_10_tensile.py`). Harmless functionally; the ordering convention from earlier in this file no longer holds.
+- **Backfilling-Batch-E recipe below is wrong now.** The Batch E in D638 is no longer the orphan-print case (it has FKs from the 2026-06-07 print). Only D790 Batch E is still the "print not in Database" case. The recipe needs to be re-scoped to "D790 Batch E only".
+- **`notes` field on rows is new** (see `_lib.py:223`). Currently only the Formlabs tensile session sets it ("Printed vertically."); other rows get empty string. Not documented in the "Row shape" section below.
+- **PA12GF_FL material class is new and not documented.** `material_class` enum below mentions only SLS/PLA/PETG; `PA12GF_FL` (Formlabs PA12 GF reference prints) should be added.
+
+The composite plots in `assets/` were regenerated and **do** reflect the current data — the Formlabs PA12 GF controls in particular reveal that the Inova Mk1 SLS specimens hit only ~10 MPa tensile vs Formlabs PA12 GF's ~25 MPa for the same nominal material, which is the comparison study these controls were added to enable.
+
 ## Ecosystem
 
 - **Upstream graph dataset**: `ppak10/Inova-Mk1-Database` — canonical print jobs, sessions, profiles, objects (see its CLAUDE.md). This dataset reads `Inova-Mk1-Database/data/jobs.jsonl` and `Inova-Mk1-Database/source/PrintProfiles/*.json` directly via a sibling-folder relative path.