A practical Tangled CLI nnabeyang.tngl.sh/swift-tangled

docs: explain stacked pull Change-Id setup #235

Merged nnabeyang.tngl.sh
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Explain how Jujutsu raw change-id headers support branch-based stacked pulls, and add a guarded Git-only preparation script for environments without Jujutsu. Document pre-push inspection, signature loss, and safe publication boundaries.

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