feat(mockups): 15 voyage look 2 (cohesive look 2, paths A strip / B in world / C timeline)

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

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

@@ -250,6 +250,12 @@ mockup of the transition.
   - **C. Timeline at the bottom** — the step bar becomes a horizontal song timeline with motif threads
     under it (the original "big horizontal line"), with "you are here".
 
+- **15 is finished and committed** (`feat/sea-chart-round`, not pushed); report in
+  `docs/design/002-sea-chart-spikes/15-voyage-look2-report.md`. Preview rebuilt with 01–15.
+  Agent's recommendation (unconfirmed): C (bottom timeline) as the home for paths, with B's ribbons
+  as an optional extra in 3D. Known: B's labels stack over the cave mouth; A is dense (numbers only);
+  C takes ~220px of stage height.
+
 ## Open questions (in priority order)
 
 1. ~~Which sea-chart approach (08–11) reads best, or which mix?~~ 11's navigation + 10's style (§9).