feat: nested spaces — SpaceSign gate, legalOwner limits, keyless governance + external seats (SYN-51, SYN-54, SYN-57) - #134

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cheggaaa/nested-spaces

Commits on Jul 7, 2026

fix(nestedspaces): pin-check parentAclRootId, V1 header, allowlist child type (review R2-1)
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fix(spacestatus): child billing pool follows parent ownership transfer
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fix(coordinator): close external-seat gate races and the elevation bypass
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fix(coordinator): unblock member-created children on live networks
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chore: pin any-sync with the replay-guard + orgPermission fixes
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fix(coordinator): serialize the external-seat gate across replicas
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