First piece of the THEMING split, using the renumber-safe stub approach so the
many "THEMING §N" citations across the corpus + code keep resolving.
§7 (Token Scope Contract) and §18 (universal coverage, v2.2) move to a new
src/uix/eidos/TSC.md — the eidos visual canon (E2), with CANON.md-style
frontmatter. THEMING.md keeps numbered pointer-stubs at §7/§18, so section
numbers (and therefore §23/§25/§26/§27/§28 citations) are untouched. 2550 -> 2271
lines; 34 headers intact, TOC anchors still resolve.
Remaining split pieces (own commits): guides §8/§9 -> E4, comparison §15 +
FAQ §17 -> E3.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>