feat(sdk): ingredient JUMBF archives, archive metadata typing

[gpeacock]

• Add Builder write_ingredient_archive(ingredient_id) and add_ingredient_from_archive
• Tag JUMBF archives with org.contentauth.archive.metadata (archive:type builder|ingredient)
• Add labels ARCHIVE_METADATA, ARCHIVE_TYPE_BUILDER, ARCHIVE_TYPE_INGREDIENT
• Add INGREDIENT_ARCHIVE_MIME; to_archive uses builder archive type
• Internal ArchiveKind + working_store_sign(kind); scoped one-ingredient claim via scoped_for_ingredient_archive
• Preserve parent claim thumbnail and copy assertions (exclude archive metadata & box hash); merge archive resources on import
• Reader::active_archive_type for ingredient-archive checks
• Test round-trip with claim thumbnail and resource merge

[codecov]

Codecov Report

❌ Patch coverage is 81.19658% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.46%. Comparing base (e0e4cc2) to head (4bc536b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sdk/src/builder.rs	79.43%	22 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #2007    +/-   ##
========================================
  Coverage   77.45%   77.46%            
========================================
  Files         176      176            
  Lines       44142    44256   +114     
========================================
+ Hits        34192    34284    +92     
- Misses       9950     9972    +22     

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[codspeed-hq]

Merging this PR will not alter performance

✅ 32 untouched benchmarks
⏩ 2 skipped benchmarks¹

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_{Comparing gpeacock/archive_ingredients (4bc536b) with main (122110d)}

Footnotes

1. 2 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩