initial commit: @arbiter/core authorization engine with js-rigor hardening

Zanzibar-style authorization graph engine (direct/chain/TTU/defeasible/
binary modes, condensed snapshots, value relations) with 39 rigor test
campaigns. Includes fixes for snapshot binary writer/reader format
mismatch (snapshot-of-snapshot corruption), possibility write-boundary
validation, empty-graph snapshot serialization, relation lookup cache
direction collision, config-redefinition cache invalidation, binary
threshold semantics, defeasible compiled routing, and comparator
reason whitelisting.

src/qualitative/index.js

@@ -0,0 +1,32 @@
+/**
+ * Qualitative Capacity System - Main Export
+ * 
+ * This module provides a complete implementation of qualitative capacities
+ * as described in the research paper on qualitative capacities and their
+ * applications to evidential reasoning, decision making, and imprecise possibility.
+ * 
+ * Core Components:
+ * - QualitativeScale: Finite totally ordered scales with negation
+ * - QualitativeCapacity: Q-capacities with QMT internal representation
+ * - QualitativeFusion: Dempster-like fusion rules for capacity combination
+ * - OWAQualitativeFusion: Bag algebras for sophisticated qualitative aggregation
+ */
+
+export { QualitativeScale, DEFAULT_QUALITATIVE_SCALE } from './QualitativeScale.js';
+export { QualitativeCapacity } from './QualitativeCapacity.js';
+export { QualitativeFusion } from './QualitativeFusion.js';
+export {
+  OWAQualitativeFusion,
+  getOWAQualitativeWeights,
+  getOWAQualitativeWeightsFromRule
+} from './OWAQualitativeFusion.js';
+export { QMTOWAFusion } from './QMTOWAFusion.js';
+export { getSetKey, setFromKey, setsEqual } from './SetUtils.js';
+export { PossibilisticConverter, LINGUISTIC_MAPPING } from './PossibilisticConverter.js';
+export { HybridFusion } from './HybridFusion.js';
+export { BilatticeOrderings } from './BilatticeOrderings.js';
+export { NumericBilatticeOrderings } from './NumericBilatticeOrderings.js';
+export { EvidenceReconciliation } from './EvidenceReconciliation.js';
+export { EvidenceAggregation } from './EvidenceAggregation.js';
+export { UnifiedEvidenceFusion } from './UnifiedEvidenceFusion.js';
+