dataforth(datasheet): Fix 2 — data-driven DSCA load note (fixes DSCA39 footer artifact)

Root cause of the DSCA39 footer mismatch: the "Standard output load for test is
250 ohms." line is a footer note, not a parameter, but the STAGE 1 extractor
captured it as a (column-truncated) row "Standard output load for te". And the
renderer's OUTSIGTYPE==='CURRENT' emission was wrong on both ends — it printed the
note (after the underline, invisible to the validator gate) for many -C current
models whose staged originals never had it, and never placed it correctly for the
models that do.

Fix is data-driven, matching the rest of the template approach:
- derive-dsca-templates.js: detect the "Standard output load..." line, capture it
  as a per-model `loadNote` property, and exclude it from rows. Regenerated
  dsca-templates.json — surgically clean: only the 5 DSCA39 models changed (lost
  the truncated row, gained loadNote); all 121 others byte-identical.
- datasheet-exact.js: emit `dscaTpl.loadNote` (blank line + note) before the footer
  underline, only for models that have it; removed the OUTSIGTYPE-based emission.

STAGE 3 re-validation: FINAL-TEST CLEAN 85 -> 88, mismatches 9 -> 6, matches
2206 -> 2278. DSCA39-01/02/07 now fully clean; DSCA39-01 byte-content-verified.
No regression — the -C current models stayed clean and no longer carry the
spurious after-underline note.

The 6 remaining dirty models (DSCA38-05/-1793/-19C/-19E, DSCA39-05, DSCA39-1950)
are ALL retest data-vintage: the staged .TXT is an older test run than the DB
latest-wins record (Supply Current / Linearity differ by more than rounding).
Not render bugs — cannot be reconciled against an older sheet.

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

projects/dataforth-dos/datasheet-pipeline/implementation/templates/datasheet-exact.js

@@ -697,6 +697,13 @@ function generateExactDatasheet(record, specs) {
             }
             lines.push(line);
         }
+        // Footer load note ("Standard output load for test is ... ohms.") — printed
+        // before the underline, only by the models whose staged original had it
+        // (captured per-model in STAGE 1; not all current-output models print it).
+        if (dscaTpl.loadNote) {
+            lines.push('');
+            lines.push(TAB5 + dscaTpl.loadNote);
+        }
     } else {
     // QB: TAB(12); "Parameter"; TAB(30); "Measured Value"; TAB(51); "Specification "; TAB(70); "Status"
     let hdr1 = setCol('', 11, 'Parameter');
@@ -794,11 +801,6 @@ function generateExactDatasheet(record, specs) {
         lines.push(setCol(TAB5 + 'Pins Straight:          __X__', 44, 'Module Header:            __X__'));
     }
 
-    // DSCA current output load note
-    if (family === 'DSCA' && specs && specs.OUTSIGTYPE && specs.OUTSIGTYPE.trim().toUpperCase() === 'CURRENT') {
-        lines.push(TAB5 + 'Standard output load for test is 250 ohms.');
-    }
-
     lines.push('');
     lines.push(TAB5 + 'It is hereby certified that the above product is in conformance with');
     lines.push(TAB5 + 'all requirements to the extent specified.  This product is not');