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()

tests/unit/vfs-restart-fix.test.ts

@@ -33,13 +33,17 @@ describe('VFS restart persistence', () => {
       entityId = await brain.vfs.resolvePathToId('/chapter-1.txt')
       expect(entityId).toBeTruthy()
 
-      // Verify within same session
+      // Verify within same session — entity, readdir, and relations
       const entity1 = await brain.get(entityId!)
       expect(entity1).not.toBeNull()
 
       const entries1 = await brain.vfs.readdir('/')
       expect(entries1.length).toBeGreaterThan(0)
 
+      // In-session getRelations: root should have Contains relationship to the file
+      const relations1 = await brain.getRelations({ from: rootId, type: VerbType.Contains })
+      expect(relations1.length).toBeGreaterThan(0)
+
       await brain.close()
 
       // === SESSION 2: Read data after restart ===
@@ -100,6 +104,10 @@ describe('VFS restart persistence', () => {
       const docEntries1 = await brain.vfs.readdir('/docs')
       expect(docEntries1.length).toBe(2) // guide.txt + api.txt
 
+      // In-session getRelations: root should have Contains relationships
+      const rootRelations1 = await brain.getRelations({ from: rootId, type: VerbType.Contains })
+      expect(rootRelations1.length).toBeGreaterThan(0)
+
       await brain.close()
 
       // === SESSION 2: Verify all data persisted ===