The previous rename commit (6ca0c6d) staged the unmodified paper.tex
content because `git mv` + `git add` picked up the on-disk file as it
was at HEAD, not the unstaged working-tree edits. This commit applies
what 6ca0c6d's message claimed:
- Title: "Nested Level Duals" → "Coloring Nested Tire Graphs"
- Adds Definition 1.5 (Tire graph) formalising (C_out, O, E_ann) with
the annular-triangulation condition, plus a Remark on vertex/edge/
face counts.
- Removes the 2026-05-22 "shelved" note.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
didericis
c0e71e2d25