Module placement 

Placement constraint evaluator for Traverse.

Governs spec: 024-placement-constraint-evaluator

Applies three tiers in order:

1. Caller hint — accept if provided and in permitted targets
2. Contract constraints — filter by permitted targets and service-type rules
3. Heuristics — select lowest-load eligible target from runtime snapshot

Structs

PlacementConstraintEvaluator

Stateless evaluator that applies the three-tier placement algorithm.

PlacementDecision

The result of a successful placement evaluation.

PlacementRequest

Input to the placement evaluator.

RuntimeSnapshot

A snapshot of runtime target load at a point in time.

Enums

PlacementConfidence

Confidence level derived from the selected target’s load score.

PlacementError

Errors that can occur during placement evaluation.

PlacementReason

Why the selected target was chosen.