Add session S02 (oats-s)

README.md

@@ -28,7 +28,7 @@ single phone photo, as the first step of estimating the thousand-kernel weight
 protocol is built around label correctness.
 
 > **Status: work in progress.** Collection is ongoing; species, lots and the test split
-> will be added. Built 2026-09-29 from 2 sessions.
+> will be added. Built 2026-10-05 from 3 sessions.
 >
 > **Preliminary release, label review pending.** A cross-check against weights and point
 > annotations found count errors in S03 cards 20–23. Cards 21 and 22 are excluded for good;
@@ -44,15 +44,16 @@ protocol is built around label correctness.
 
 | | |
 |---|---|
-| Images | 333 |
-| Arrangements (distinct kernel layouts) | 55 |
-| Kernels per image | 225 – 787 |
+| Images | 457 |
+| Arrangements (distinct kernel layouts) | 86 |
+| Kernels per image | 225 – 798 |
 | Images with point annotations | 28 |
-| Splits | train: 333 |
+| Splits | train: 457 |
 
 | Session | Species | Lot | Light | Chaff | Cameras | Images | Arrangements | Kernels |
 |---|---|---|---|---|---|---|---|---|
 | S01 | rye-w | rye-w-A | desk | light | Galaxy S23, iPhone 8 | 108 | 27 | 274–787 |
+| S02 | oats-s | oats-s-A | desk | none | Galaxy S23, iPhone 8 | 124 | 31 | 240–798 |
 | S03 | barley-w | barley-w-A | desk | light | Galaxy S23, SM-P610, iPhone 8 | 225 | 28 | 225–733 |
 
 ## Fields
@@ -134,7 +135,10 @@ whose chain breaks (a skipped or unread card) stays *suspect* until the next CHE
 groups before an INVALIDATE are *invalidated*. **Only groups whose chain validated are in
 this dataset**, after a review of every group by eye. One exception: S01 cards 9–11 were
 invalidated by the chain but are included, because their point annotations match `count`
-exactly. Card photos and scale photos are not included.
+exactly. In S02 the Galaxy S23 missed the card photos of cards 6 and 22; its photos of
+those two layouts are placed on the card by hand, because they show the same layout as the
+iPhone 8 photos of that card, and the chain validates with them. Card photos and scale
+photos are not included.
 
 ## Splitting