fix(artifacts): follow dyld slice grading and report unparsed images

Address review findings in trace_dylib_resolution:
- Choose child slices by dyld's graded architectures, so an x86_64h
  process loads a generic x86_64 slice instead of reporting
  architecture-missing.
- Read FAT containers with the byte-swapped FAT_CIGAM and FAT_CIGAM_64
  magics, which target opening already accepts.
- Report string-bearing load commands too short to hold their string
  offset as malformed instead of failing with a RangeError.
- Keep recognized but unsupported images as an `unsupported` candidate
  outcome. It is undeterminable like an outside-root path, not
  malformed.
- List Mach-O files that do not parse during root enumeration as
  unparsed images, so coverage is partial rather than silently complete.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/apple-application-analysis.md

@@ -149,8 +149,10 @@ Resolution follows dyld:
   An escape through `..` or an absolute link is `escapes-target`.
 
 Each edge lists every candidate path tried, with its outcome: `resolved`,
-`absent`, `not-mach-o`, `malformed`, `architecture-missing`, `outside-target`,
-`escapes-target`, or `undetermined`. The edge's `resolution` is one of:
+`absent`, `not-mach-o`, `malformed`, `unsupported` (recognized Mach-O outside
+parser coverage, such as big-endian images), `architecture-missing`,
+`outside-target`, `escapes-target`, or `undetermined`. Slices follow dyld's
+graded architectures, so an `x86_64h` process also loads `x86_64`. The edge's `resolution` is one of:
 
 | Status         | Meaning                                                                                                                                                   |
 | -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- |