docs(design): threads chosen for motifs in plates

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/design/002-direction-round-notes.md

@@ -173,10 +173,21 @@ This file exists because of that request. It gets updated after every user messa
   hand-lettered part names for the picked theme. Known weak spot: A's faded labels on the 7-theme
   Cyclops plate are ~9px.
 
+### 12. Motifs inside a plate: threads
+
+> "Threads, definetly."
+
+- **Chosen:** treatment **A, Threads under the sea**, for motifs inside a plate. B (pennants) and C
+  (ink only) are deselected.
+- Known weak spot to fix when it is built for real: faded thread labels on busy plates (~9px on the
+  7-theme Cyclops plate) need more room.
+- *(Claude's proposal)* The 2D sea chart is now 12 Vellum atlas with threads. Next open questions are
+  the look of the whole and how the frieze/3D layers attach to this chart.
+
 ## Open questions (in priority order)
 
 1. ~~Which sea-chart approach (08–11) reads best, or which mix?~~ 11's navigation + 10's style (§9).
-   Now: how should motifs show inside a plate (12's toggle A/B/C)?
+   Then A/B/C inside plates: **A threads** (§12).
 2. What is the look of the whole: frieze-led (terracotta and black), chart-led (parchment), or
    something in between? The user is "not sure" yet.
 3. How do 2D and 3D relate as products? Is the 3D the main experience with the chart inside it, while