fix(macho): support intel mac dylibs in find_section_in_current_image

[jlarmstrongiv]

This PR is an example implementation with Claude. Proceed with caution or ignore entirely. Closes #73

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On x86_64 macOS, write_section appends the payload past __LINKEDIT behind a <sui-data> sentinel instead of creating a real Mach-O section, so getsectiondata cannot find it. The previous find_section_in_current_image stub returned Ok(None), breaking embedded data lookups from dylibs (e.g. deno desktop's denort dylib on Intel Macs).

Refactor intel_mac::find_section into a path-taking helper and resolve the current image's file via dladdr, mirroring how the aarch64 branch already locates its own image.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.79%. Comparing base (307b58c) to head (d6ea8e6).

Files with missing lines	Patch %	Lines
intel_mac.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #74      +/-   ##
==========================================
- Coverage   72.00%   71.79%   -0.21%     
==========================================
  Files           3        3              
  Lines        1036     1039       +3     
==========================================
  Hits          746      746              
- Misses        290      293       +3     

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