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I really want a caniuse.com (canicli / caniconsole?) of this data.

Something close to that is the table here:

It's not at the lowest granularity though.

How can it detect if Unicode codepoints have corresponding glyphs?

It cannot. But it can detect whether the terminal emulator is shifting the cursor by the correct number of cells when displaying a character.

Glyph support is typically left to the system font stack, but positioning and hence cursor movement needs to be handled by the terminal emulator.

In that case, I want a detection software that can screen-grab the terminal to check if the glyphs are correct.

Is there a way of reporting this to the terminal creators?

Thanks for recommending foot. Never heard of this one

When you want plain text and nothing but plain text, Unicode in the terminal is a hazard.

That has nothing to do with unicode.

> ucs-detect automatically tests the Unicode version and support level...

The first line of the site suggests otherwise.

The link in userbinator's comment has nothing to do with unicode. ucs-detect obviously does.

Ucs-Detect