Configure Copilot instructions per best practices #120

Job	Run time
Format Check	23s
Clippy	1m 56s
Minimum Supported Rust Version	36s
Test (windows-latest, stable)	24m 7s
Test (ubuntu-latest, beta)	7m 47s
Test (ubuntu-latest, stable)	7m 41s
Test (macos-latest, stable)	7m 1s
	49m 31s

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