[WIP]refactor!: redesign pipeline with chain-based engine and NodeStar system#4960

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Commits on Feb 4, 2026

refactor!: redesign pipeline with chain-based engine and NodeStar system
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Merge remote-tracking branch 'upstream/master' into next
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Commits on Feb 5, 2026

fix: sync internal agent executor with main agent refactor and add WaitState validation, remove NodeResult.SKIP
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Merge remote-tracking branch 'upstream/master' into next
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Commits on Feb 8, 2026