feat(codex): event-stream parser tap for the unified harness surface #683

Job	Run time
check-permissions	5s
find-agents	5s
Deprecate Removed Agents	4s
build-examples/tutorials/10_async/10_temporal/harness_codex	4m 38s
build-examples/tutorials/10_async/00_base/harness_codex	4m 33s
build-examples/tutorials/00_sync/harness_codex	4m 32s
	13m 57s

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