Create envelope-compatibility.md

Author: haku-field

relations/envelope-compatibility.md

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+# Envelope Compatibility — distance-behavior
+
+This document defines how distance-behavior remains compatible with
+**RET-envelope** without modifying RET-core or expanding envelope semantics.
+
+distance-behavior functions as a **supportive fragment**
+that preserves the relational contour defined by RET-envelope.
+
+---
+
+## Non-Interference With RET-core
+
+distance-behavior does not:
+
+- modify RET-core definitions
+- reinterpret existence modes
+- introduce new ontological assumptions
+
+All core-level properties remain unchanged.
+
+distance-behavior operates strictly **above core level**.
+
+---
+
+## Envelope Preservation Role
+
+RET-envelope defines:
+
+- relational contour
+- continuity conditions
+- reopenability
+
+distance-behavior exists to **maintain these properties in practice**
+by allowing reversible distance displacement.
+
+It does not redefine:
+- what a relationship is
+- when a relationship exists
+- why a relationship matters
+
+---
+
+## Reopenability Constraint
+
+All distance operations must satisfy:
+
+- reopenability remains intact
+- no distance shift implies finality
+- no operation closes relational return paths
+
+If a distance adjustment compromises reopenability,
+it is considered incompatible with RET-envelope.
+
+---
+
+## Contour Integrity
+
+distance-behavior must not:
+
+- sharpen relational boundaries
+- harden separation into exclusion
+- transform distance into partitioning
+
+Distance changes adjust **placement within the contour**,
+not the contour itself.
+
+---
+
+## Conflict Resolution
+
+When distance-behavior encounters conflict with envelope constraints:
+
+- envelope definitions take precedence
+- distance reverts to baseline placement
+- no compensatory control is introduced
+
+Compatibility favors preservation over action.
+
+---
+
+## No Semantic Expansion
+
+distance-behavior must not expand envelope semantics by:
+
+- adding evaluative meaning to distance
+- encoding behavioral expectations
+- introducing optimization goals
+
+Envelope meaning remains authoritative.
+
+---
+
+## Summary
+
+distance-behavior is envelope-compatible when it:
+
+- leaves RET-core untouched
+- preserves envelope-defined continuity
+- maintains reopenability under all distance shifts
+- refrains from semantic or control expansion