[codex] Add default Origin for streamable HTTP client #2425

Job	Run time
checks / pre-commit	29s
checks / readme-snippets	10s
checks / test (3.10, locked, ubuntu-latest)	59s
checks / test (3.10, locked, windows-latest)	2m 38s
checks / test (3.11, lowest-direct, ubuntu-latest)	56s
checks / test (3.11, locked, ubuntu-latest)	1m 1s
checks / test (3.10, lowest-direct, windows-latest)	2m 12s
checks / test (3.12, lowest-direct, ubuntu-latest)	58s
checks / test (3.11, lowest-direct, windows-latest)	3m 8s
checks / test (3.12, locked, ubuntu-latest)	1m 0s
checks / test (3.11, locked, windows-latest)	2m 46s
checks / test (3.12, locked, windows-latest)	3m 30s
checks / test (3.13, locked, ubuntu-latest)	57s
checks / test (3.13, locked, windows-latest)	3m 45s
checks / test (3.13, lowest-direct, windows-latest)	3m 21s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.13, lowest-direct, ubuntu-latest)	55s
checks / test (3.14, lowest-direct, windows-latest)	2m 33s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.12, lowest-direct, windows-latest)	3m 31s
checks / test (3.14, locked, ubuntu-latest)	2m 19s
checks / test (3.14, locked, windows-latest)	3m 12s
all-green	3s
	42m 47s

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