dataforth/testdatadb: 8B/5B/SCM render verify results + convergence plan

Stage+verify (template-gated, no slotmaps/precision yet) vs Hoffman, content-only:
15 models content-perfect, 17 precision-distance, 70 NULL (need slotmaps), 8B38/7B
family-specific. Remaining work = AD2's existing DSCA machinery (slotmaps / Math.fround
QB rounding / frequency-AAC accuracy labels). Recommend converging with AD2's DSCA path.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

projects/dataforth-dos/8B5BSCM-RENDER-VERIFY-2026-06-18.md

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+# 8B/5B/SCM Render Fix — Diagnosis + Stage/Verify Results (2026-06-18)
+
+Driving the ~5,148 unpublished 8B/5B/SCM PASS records (render-coverage gap, same class as DSCA).
+
+## Root cause (validated)
+1. **parseRawData bug (general):** a PASS/FAIL line is wrongly consumed as the step-response line
+   for non-DSCA families that omit the `"0","0",v` line (8B45/8B49/5B39/SCM5B33...) -> drops the
+   first Final-Test group -> measurement-count mismatch -> null. Fix: change the step-skip guard to
+   `if (!((family === 'DSCA' || skipStepIfStatus) && looksLikeStatus))` and pass `skipStepIfStatus`
+   only for templated models (so non-templated models are byte-unchanged).
+2. **No per-model Final-Test template:** one hardcoded `DATA_LINES['8B']` (RTD-shaped) -> wrong
+   param names/specs for non-RTD models (8B45 is frequency-input == DSCA45). Needs per-model
+   templates, same as DSCA. The "published" siblings render null too (legacy content on Hoffman;
+   `api_uploaded_at` was back-populated from Hoffman inventory, NOT from our render).
+
+## Artifacts
+- `8b5bscm-templates.json` — 136 models mined from Hoffman originals (accOut, accHeader, rows, _srcSerial).
+- Verify harness pattern: patch a TEMP copy of datasheet-exact.js (parse-fix + template-gated
+  Final-Test, footer skip), render each model's published `_srcSerial`, content-normalized compare
+  to its Hoffman original. (Never touches the live renderer.)
+
+## Verify results (template-gated Final-Test only; NO slotmaps/precision/accuracy-label work yet)
+Content-only (cosmetic header/spacing deferred, per the DSCA byte-fidelity decision):
+- 15 models content-perfect (>=0.99) — publishable as-is.
+- 17 within precision-tuning distance (0.93-0.97) — single value-row rounding diffs.
+- 27 @ 0.85-0.93, 7 < 0.85.
+- 70 NULL — render-count mismatch -> need per-model slotmaps.
+- By family: 8B avg 0.97, SCM5B 0.93 (strong); 8B38 0.78; 7B ~0.88 (separate parse path).
+
+## Remaining work = the SAME machinery AD2 built for DSCA
+1. Per-model **slotmaps** for the 70 nulls (AD2 `_derive_slotmaps.js`) — derive by matching rendered
+   measured values to the Hoffman original's displayed values.
+2. **QB single-precision rounding** (AD2 `Math.fround`) — closes the 0.93-0.97 precision diffs.
+3. **Frequency/AAC accuracy-block labels + stimulus formatting** — the still-open DSCA45/33 piece
+   (8B45/8B49/5B45 are frequency-input; SCM5B33 is AAC). Solving once covers BOTH 8B/5B AND DSCA45/33.
+4. 8B38 (0.78) + 7B family (separate SCM7B path) — family-specific.
+
+## Recommendation
+Converge with AD2's mature DSCA machinery rather than re-implement in parallel in the shared
+`datasheet-exact.js`: feed the mined `8b5bscm-templates.json` into AD2's template/slotmap/rounding
+path and finish the frequency/AAC accuracy renderer once for DSCA + 8B/5B/SCM together.
+The 15 content-clean models can be published immediately if a partial win is wanted.