[Irev-Dev]

This adds native_brep as an export format and defines its data contract in format/native_brep.rs. Defining the geometry here is unusual for our export formats, but this one is consumed by both Engine and the browser mesher, so it needs a shared home without making the browser depend on the private format repo. Capture, encoding and meshing stays in the other repos.

format/native_brep.rs This is the main contract between the engine and the browser.

[codecov]

Codecov Report

❌ Patch coverage is 95.52239% with 3 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@783d311). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
modeling-cmds/src/format/mod.rs	81.25%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1492   +/-   ##
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  Coverage        ?   42.00%           
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  Files           ?       34           
  Lines           ?     1914           
  Branches        ?        0           
=======================================
  Hits            ?      804           
  Misses          ?     1110           
  Partials        ?        0           

Flag	Coverage Δ
unittests	42.00% <95.52%> (?)

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