feat(runtime-core): forward live sidecar stderr via AGENTOS_SIDECAR_STDERR#1801

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stack/fix-runtime-core-handle-stdin-error-events-in-stdioframetransport-lukwzrznrivet-dev/agentos:stack/fix-runtime-core-handle-stdin-error-events-in-stdioframetransport-lukwzrznfrom

stack/feat-runtime-core-forward-live-sidecar-stderr-via-agentos_sidecar_stderr-ksksyyuvrivet-dev/agentos:stack/feat-runtime-core-forward-live-sidecar-stderr-via-agentos_sidecar_stderr-ksksyyuvCopy head branch name to clipboard