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In hard anodized aluminium, the anodization's resulting oxide layer is a ceramic–
so would hard anodized aluminium foil be fire-proof if used in a wood stove, providing anodizing is thick enough. Even if inner plain aluminium melted would the ceramic hold it together till "unmelts"?
No. It wouldn't. Alumina (aluminum oxide) is extremely brittle. On anodized foil it is actually millions of separate little particles individually bound to the metallic aluminum substrate, all of them separated by a web of billions of tiny cracks and fissures. It isn't one continuous sheet of ceramic. The anodized surface has no more structural value than the paint on a house.
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