pdftotext is a false oracle for emoji: Skia preserves the Unicode in the
text cluster even when the glyph drew as .notdef tofu, so extraction passes
on a broken render. The gate instead asserts (1) pdffonts shows an emoji
family embedded and (2) pdftoppm rasterizes the page to color (measured
~1650 saturated pixels vs ~0 for tofu). pdfimages is not used: macOS embeds
color emoji as Type 3 fonts, so it lists nothing even on a correct render.
Adds resolvePopplerTool() (DRY resolver, returns null for clean skips) and
a fixture exercising FE0F variation-selector emoji. Skips cleanly when
poppler tools or a color-emoji font are unavailable.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Garry Tan