standdown

Integrate the `standdown` affiliate stand-down library into a browser extension and grade its conformance F→A+. Use when the user wants their extension to stop hijacking existing affiliate attribution (stand down when a partner already owns the sale), when they ask to "add standdown" / "install standdown", or when they want to grade/verify an extension's stand-down behavior.

Migrate an extension that ALREADY has homegrown stand-down / affiliate-suppression logic onto the `standdown` library without losing revenue. Use when the target already suppresses activation on prior affiliate attribution (has disable_domains, ignore_param, cookie/param stand-down checks, a FALLBACK_POLICY, or "stand down"/"suppress" code) and the user wants that logic moved onto `standdown` safely. For an extension with NO stand-down today, use the greenfield "install standdown" skill instead.