Release 0.1.6

0.1.6 2026-02-28

• Breaking: DatabaseService replaced by CatalogService (catalog > schema > graph hierarchy per GQL spec sec 12.2-12.7)
• Breaking: DatabaseClient replaced by CatalogClient with schema, graph, and graph type operations
• Breaking: Admin/Search request messages renamed database field to graph
• Breaking: GqlBackend trait: removed list_databases, create_database, delete_database, get_database_info; added list_schemas, create_schema, drop_schema, list_graphs, create_graph, drop_graph, get_graph_info, list_graph_types, create_graph_type, drop_graph_type
• Feature: AdminClient wrapper for stats, WAL, validation, and index operations
• Feature: SearchClient wrapper for vector, text, and hybrid search
• Feature: Value ergonomics: TryFrom<Value> for 11 types, as_*() accessors, is_null(), type_name()
• Feature: From<f32> for Value (lossless promotion to f64)
• Feature: execute_simple() convenience on GqlSession and Transaction
• Feature: TypeDescriptor extended with precision, scale, min/max length, max cardinality, group/open flags, duration qualifier, component types
• Feature: New GqlType variants: TYPE_EMPTY, TYPE_YEAR_MONTH_DURATION, TYPE_DAY_TIME_DURATION, TYPE_NODE_REFERENCE, TYPE_EDGE_REFERENCE, TYPE_GRAPH_REFERENCE, TYPE_BINDING_TABLE_REFERENCE
• Feature: DurationQualifier enum for year-to-month vs day-to-second duration distinction
• Feature: ResultHeader.ordered field for semantically meaningful row ordering
• Feature: DiagnosticRecord extended with invalid_reference field, current_schema now optional
• Feature: ~30 new GQLSTATUS code constants (warnings, informational, data exceptions, transaction state, syntax, dependent objects)
• Feature: warning() and informational() GQLSTATUS constructors
• Feature: 25+ operation code constants (Table 9 from GQL spec)

Full Changelog: v0.1.5...v0.1.6