White-label gap: the hero mark is replaceable, the hero tagline isn't

[shen-laminagrid]

A third party who white-labels DSH can replace the conversation hero brand mark (it is a declared slot) but cannot replace the hero headline, which is hardcoded product copy with no slot and no locale override path. Requesting a supported seam for product copy — ideally an overrideTokens-style API on the locale runtime — so rebranding does not require suppressing upstream-owned DOM.

The theme subsystem already exposes exactly this kind of seam: theme.overrideTokens(source, tokens) layers overrides over the active theme, stacks last-writer-wins, and is scoped to the registering plugin's fiber. The locale runtime has no equivalent — so a rebrand can restyle every pixel of DSH but cannot reword a single product string.