doc: add portable agentic instructions #145

Job	Run time
test / Lint	34s
test / fuzz-test / Fuzz matrix	29s
test / Unit tests (windows-latest, stable)	53s
test / Unit tests (macos-latest, oldstable)	38s
test / Unit tests (ubuntu-latest, stable)	40s
test / Unit tests (ubuntu-latest, oldstable)	19s
test / Unit tests (macos-latest, stable)	26s
test / Unit tests (windows-latest, oldstable)	51s
test / fuzz-test / fuzz test (github.com/go-openapi/jsonreference, FuzzParse)	2m 8s
test / collect-reports / collect test reports	12s
test / tests completed	3s
test / collect-coverage / collect test coverage	21s
	7m 34s

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