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Deep-research 2026-07-10 (adversarially verified): the Gemini sparkle is tier-gated (visible on Free/Pro, absent on Ultra/AI-Studio/API; no official visible-mark detector or published glyph spec); the faint-visible-mark precision/recall wall is fundamental (learned CNN front-end does not cleanly separate true/false, arXiv:1705.08593 refuted); learned detectors need large synthetic-composite datasets + carry off-distribution risk; landscape adds Meta bottom-left + Samsung star-icon variants; China GB 45438-2025 is the strongest visible-mark mandate. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>