feat: add experimental wealth-ledger-sdd-lab OpenSpec schema (#61)

2026-10-29 05:58:29 +03:00
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+# Data Mapping
+
+<!-- guide: Field-level transformation between systems. Large mappings go to a
+     machine-checkable file in contracts/ and are referenced here. Remove guides. -->
+
+## Source and Target
+
+| Mapping | Source (owner) | Target (owner) | Direction | Trigger |
+| --- | --- | --- | --- | --- |
+
+## Field Mapping
+
+| Target field | Source field(s) | Transformation | Unit / currency / scale | Nullability | Default | Validation | On failure |
+| --- | --- | --- | --- | --- | --- | --- | --- |
+
+## Invariants
+
+<!-- guide: Conservation rules that must hold after mapping, e.g. "total = sum of
+     positions + cash; each money unit counted once", sign conventions, rounding
+     point. Each invariant references the spec requirement it protects. -->
+
+## Double-counting and Classification Risks
+
+<!-- guide: Every source record type that could fall into two target aggregates,
+     and the rule that assigns it to exactly one. -->
+
+## Transformation Errors
+
+## Open Questions