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docs: document GitHub Copilot CLI support (#30)

Copilot CLI already reads AGENTS.md and .github/copilot-instructions.md
(both shipped), plus a global ~/.copilot/copilot-instructions.md. Add an
agent-portability row and a README note. Instruction-tier only: no
/ponytail levels or hooks.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

DietrichGebert committed 5d ago

16319c7bc91b098975d2bfb2e351398ff8aae3e7

Parent: e01aa90

Committed by GitHub <noreply@github.com> on 6/14/2026, 4:27:21 PM