docs: Update Copilot instructions — secrets & PR checklist #102
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This PR updates GitHub Copilot instructions and related documentation to improve secrets handling and developer guidance.\n\nSummary:\n- Removed hardcoded environment examples from Copilot instructions and added secure guidance for environment variables and secret managers.\n- Added a short Secrets Policy and PR/commit checklist for contributors.\n- Added guidance about Copilot usage (never generate code with embedded credentials).\n- Updated README and MIGRATION.md to reference the new Copilot instructions.\n\nChecklist:\n- [x] No secrets or hardcoded credentials are introduced in this diff\n- [x] Code formatting and static checks suggested (black, flake8, mypy)\n- [x] README and MIGRATION.md updated to reference Copilot guidance\n- [ ] Tests added/updated where applicable (use mocks/fixtures for API calls)\n- [x] Documentation and migration notes updated for any public API or behavior changes\n- [x] Security note added (recommend follow-up pre-commit/secret-scan PR)\n\nRequested reviewers: @mattwyen — please add other maintainers as needed for security review.