20260718 product surface
Flag adds (experiments / params)
Accent / theming
black-uses-blue-secondary-accentsblue-horizon-uses-lavender-palettedefault-accent-treatment
Deep research
reactive_deep_research_submit_variant_v1
No official release notes; no flag removals (nothing newly marked live from this diff). Statsig gate/config/layer counts unchanged. Sitemap only bumped /work lastmod.