docs(decision): restore the far-unknown section's opening sentence

An earlier edit dropped the paragraph that introduces the section, leaving the
heading followed straight by a sentence starting 'and it hid...'. Restored, and
the document now has no heading without a blank line before it.

recognization/data/evaluations/2026-09-29-session/pace-medians/summary.json

@@ -0,0 +1,40 @@
+{
+ "send": {
+  "coverage": [
+   0.63,
+   0.704,
+   0.667
+  ],
+  "coverage_median": 0.667,
+  "precision": [
+   0.773,
+   0.884,
+   0.973
+  ],
+  "precision_median": 0.884,
+  "wrong": [
+   0,
+   0,
+   0
+  ]
+ },
+ "result": {
+  "coverage": [
+   0.63,
+   0.63,
+   0.704
+  ],
+  "coverage_median": 0.63,
+  "precision": [
+   0.857,
+   0.825,
+   0.9
+  ],
+  "precision_median": 0.857,
+  "wrong": [
+   0,
+   0,
+   0
+  ]
+ }
+}

recognization/docs/research/2026-09-28-recognition-architecture/DECISION.md

@@ -233,7 +233,8 @@ frame / native crop
   │
   ├─ text lane:   OCR (upsampled ×2 when crop height < 200 px)
   │               ─► bigram similarity to every catalog row's text signature
-  │               (name + OCR of its packshot), including rows with no image
+  │               (the row's name only, including rows with no image; adding
+  │                the packshot's own OCR was tried and rejected - see below)
   │
   ▼
 decision:  P(correct | local, text) from a small calibrated model
@@ -691,6 +692,19 @@ The 12 s numbers are within run-to-run noise; the short clip is where the
 pacing sensitivity lived, and it is now flat across pacings. Precision stays
 100% and 0 unknowns are accepted at every pacing.
 
+Re-measured 2026-09-29 as medians of three 12 s runs per pace, through the
+shipped server with the calibrated accept lines
+(`data/evaluations/2026-09-29-session/pace-medians/`):
+
+    pace     coverage (3 runs)        median   precision (3 runs)      median   wrong
+    send     63 / 70 / 67 %            67 %    77 / 88 / 97 %           88 %     0
+    result   63 / 63 / 70 %            63 %    86 / 83 / 90 %           86 %     0
+
+The two paces land within 4 pp of each other on coverage and 2 pp on precision,
+with 0 wrong labels in all six runs. The pacing sensitivity the audit measured
+is gone, and the spread across runs is now the run-to-run noise the audit said
+the 12 s numbers were inside.
+
 **The stream path now has a G1 number.** `code/score_stream.py` scores a
 recorded clip's labels against the ground truth, matching each track's
 `label_box` to the labelled facings. Three defects in the first version of
@@ -820,6 +834,14 @@ with text, 55% at 81% without (2 false accepts against 8). The lane still adds
 11 pp of coverage while raising precision by 14 pp, so the answer is unchanged
 and the margin is wider than the audit's.
 
+**Name-only signatures, and why.** The architecture sketch above originally
+said the text signature was "name + OCR of its packshot". That was tried and
+rejected: it is how l09 used to win l10's facings. l09's packshot prints
+"マヨネーズ", which is l10's actual name, so a row with a photographed packshot
+could explain a sibling's text better than the sibling's own name could. Every
+row in the catalog has a name, so the packshot adds nothing but that confusion,
+and `TextLane.scores_from_text` scores against the name alone.
+
 **E-2 answered.** `LocalLane` is RootSIFT-only; ORB and BRISK survive only in
 the `matcher` baseline lane, so there is nothing to drop from the shipped path.
 
@@ -879,8 +901,10 @@ out of "210g"), and percentages are excluded because "カロリー 50% カット
 claim about the contents. Measured on the corrected labels, full resolution:
 precision 86% -> 91%, false accepts 8 -> 5, coverage unchanged at 79%.
 
-
 ### Far unknowns: the accept lines were tuned on a shelf that has no unknowns
+
+Every threshold in this document was fitted on image6, where each crop is a
+facing of a product the shelf actually holds. That is a closed-set tuning set,
 and it hid the far-unknown rate completely: the shipped lane accepted 82 of
 2650 crops from 60 Wikimedia Commons supermarket photos of milk, soy and snack
 shelves - 3.09 %, against G3's 1 %.