* fix(heal): certify metadata health and marker repair receipts
* fix(heal): match nil selectors to absent null metadata
* test(heal): satisfy clippy for nil selector proof
* test(heal): align normal-scan receipt with nil selector proof
A nil or omitted selector now matches only a nil or absent metadata
version, so a normal scan of the latest UUID version leaves
metadata_verified unset and issues no receipt.
Assert metadata health through the exact latest version id instead, and
pin the omitted-selector path to fail closed.
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Co-authored-by: Hauser <housemecn@gmail.com>
cxymds
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