docs(furniture-dal): add domain boundary notes

docs/architecture/dal-domain-alignment.md

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+# Furniture DAL Domain Alignment
+
+## Goal
+Align DAL with furniture-domain abstractions while keeping DAL technical.
+
+## DAL Responsibilities
+- Persistence and retrieval
+- Technical data translation
+- Provider/repository boundaries
+
+## Prohibited
+- Domain decision ownership
+- Service orchestration concerns

docs/migration/dal-port-alignment-map.md

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+# DAL Port Alignment Map
+
+## Alignment Areas
+- DAL read/write ports map to domain contracts.
+- Technical DTO translation remains in DAL adapters.
+- Domain invariants are not reimplemented in DAL.

docs/migration/technical-mapping-rules.md

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+# Technical Mapping Rules
+
+## Rules
+- Mapping logic must remain technical and deterministic.
+- No business branching in DAL mapping layer.
+- Correlation and metadata pass-through remains unchanged.