doc: add portable agentic instructions #231

Job	Run time
test / Lint	36s
test / fuzz-test / Fuzz matrix	32s
test / fuzz-test / fuzz test (github.com/go-openapi/jsonpointer, FuzzParse)	2m 22s
test / Unit tests (macos-latest, stable)	49s
test / Unit tests (macos-latest, oldstable)	26s
test / Unit tests (windows-latest, stable)	55s
test / Unit tests (windows-latest, oldstable)	50s
test / Unit tests (ubuntu-latest, oldstable)	13s
test / Unit tests (ubuntu-latest, stable)	44s
test / tests completed	4s
test / collect-reports / collect test reports	16s
test / collect-coverage / collect test coverage	21s
	8m 8s

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