Preserve format and Evidence semantics at their owning boundaries, with focused regression coverage and documentation where applicable.
Fixes#6773Fixes#6786
Return unknown before fingerprinting incomplete accessibility trees. Keep
known structural changes comparable when only text permission is absent,
and preserve independent changes in other dimensions.
Validated through seven CLI cases and existing network comparison semantics.
Refs #3385, #3824.
Co-authored-by: Liu Jie <maxazure@gmail.com>