Fixes #14122

Now that logo-light-dark-specifier-path-optional accepts `false`,
return `undefined` explicitly for all falsy values rather than
leaking `false` through to resolveLogo.

…14160)

* Fix meta shortcode truncating multi-word values in raw HTML contexts

* Update rules for changelog regression policy and regex match format

…e-escape.lua` (#14162)

* avoid O(n^2) backtracking (#14156)

* changelog

* move local decl inside function to avoid too many variables