fix(native): preserve parsed section and architecture facts

Classify lipo parse failures once for native and artifact consumers, retain valid read-only ELF ranges independently of optional section names, and map IL2CPP reader architecture through the existing CPU identity owner before Mach-O parsing.

Regression-first checks reproduced malformed lipo output, lost unnamed-section compiler paths, and the amd64/x86_64 adapter mismatch. Focused parser, artifact, Rust CLI/MCP, Go, and IL2CPP controls passed; authored fixtures do not establish real-provider behavior.

Fixes #5982

Fixes #3397

docs/rust-binaries.md

@@ -117,9 +117,16 @@ removed the field entirely, as recorded in its
 [changelog](https://github.com/rust-secure-code/cargo-auditable/blob/v0.5.0/CHANGELOG.md).
 
 `rustc_commit` is present only when a `/rustc/<40-hex>/` path is found in
-read-only data. For ELF, read-only non-executable `PT_LOAD` file ranges are
-searched alongside read-only sections, so an optional missing section-header
-table does not remove this search source. Its `evidence_kind` is `inferred`.
+read-only data; its `evidence_kind` is `inferred`. For ELF, read-only
+non-executable `PT_LOAD` file ranges are searched alongside read-only sections,
+so an optional missing section-header
+table does not remove this search source. An empty or unavailable section name
+does not erase a section's validated read-only range: ELF defines the
+[section-name index](https://gabi.xinuos.com/elf/03-sheader.html#section-header-table-entry)
+separately from its type and flags, and
+[string-table index zero](https://gabi.xinuos.com/elf/04-strtab.html) means no name.
+REA preserves known empty names separately from unavailable names; an unavailable
+name table still leaves `.dep-v0` presence unknown.
 The hash is not a claim that that compiler produced the binary. Several
 distinct hashes leave a single commit unknown.