Add external model persistence foundation
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@@ -269,6 +269,13 @@ complete transport/column/family-rule configuration through the revision-safe
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endpoint and requests a stateless preview. Preview responses include all mapped
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objects, while the UI renders only the first 25. No preview creates external
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objects, rows, revisions or server-side drafts.
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Phase 14.2 migration `0003` provides one implicit Revit CSV source per project,
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immutable import batches with original bytes plus the classified cell matrix,
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normalized source-room mappings and external objects unique by
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`(sourceId, ifcGuid)`. Source values, planning values and overrides are separate.
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The current repository is read-only; no runtime import command writes these
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tables yet, and snapshot/transfer schema remains version 3 until the next work
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package adds version 4 atomically.
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The central revision boundary creates an automatic logical snapshot after each
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25 new revisions and retains only the newest 12 automatic snapshots per
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project. Named snapshots are never removed by this retention policy.
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