Gracefully skips figment tests when system Cairo library is unavailable
instead of crashing with opaque OSError during test collection.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Implements phase-aware (REVEAL/HOLD/DISSOLVE) ANSI cursor-positioning overlay
renderer for figment glyphs, with deterministic shuffle seeding and gradient
coloring via _color_codes_to_ansi(). Includes 6 TDD tests.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
