Fix figure paths for inara PDF build

inara/pandoc runs from the repo root, so relative image paths in
paper/paper.md resolve against root, not paper/. Copy PNGs to root
before the build step so pandoc finds them.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: TomeHirata

.github/workflows/draft-pdf.yml

@@ -10,6 +10,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5  # v4
+      - name: Copy figures to repo root for inara
+        run: cp paper/*.png .
       - name: Build draft PDF
         uses: openjournals/openjournals-draft-action@85a18372e48f551d8af9ddb7a747de685fbbb01c  # master
         with: