fix: set verb.source/target to entity UUID instead of NounType

relate() was setting verb.source = fromEntity.type (a NounType like
"concept") instead of the entity UUID. Cortex's graph index indexes by
verb.source, so lookups by UUID found nothing — causing in-session
reads to return 0 results.

Also fixes:
- PathResolver calling private getIdsFromChunks() → public getIds()
- Plugin auto-detection removed; cortex loads only via explicit config
- GraphVerb types accept number timestamps and sourceId/targetId aliases
- Dead autoDetect() method removed from PluginRegistry
- In-session regression tests added for getRelations after relate()

src/types/graphTypes.ts

@@ -369,12 +369,14 @@ export interface GraphNoun {
  */
 export interface GraphVerb {
   id: string // Unique identifier for the verb
-  source: string // ID of the source noun
-  target: string // ID of the target noun
+  source: string // Entity UUID of the source noun
+  target: string // Entity UUID of the target noun
+  sourceId?: string // Alias for source (coreTypes compatibility)
+  targetId?: string // Alias for target (coreTypes compatibility)
   label?: string // Optional descriptive label
   verb: VerbType // Type of relationship
-  createdAt: Timestamp // When the verb was created
-  updatedAt: Timestamp // When the verb was last updated
+  createdAt: Timestamp | number // When the verb was created
+  updatedAt: Timestamp | number // When the verb was last updated
   createdBy: CreatorMetadata // Information about what created this verb
   service?: string // Multi-tenancy support - which service created this verb
   data?: Record<string, any> // Additional flexible data storage