Add comprehensive GitHub Copilot instructions for Meshroom development#2831

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Copilot wants to merge 3 commits intodevelopfrom

copilot/fix-2830

Commits on Aug 17, 2025

Initial plan
Copilot
committed
Complete initial validation: all basic setup and testing processes work

Copilot
and
fabiencastan
committed
Create comprehensive .github/copilot-instructions.md with fully validated commands

Copilot
and
fabiencastan
committed