feat(8.0): id-normalization (#18) + aggregation min/max delete-safety + RC-safe release

- id-normalization (#18): `brain.newId()` (UUID v7) + v7 default ids; non-UUID string ids are
  transparently normalized to a stable UUID v5 on creation AND every lookup — get/update/remove,
  relate(from,to), related, find({connected}), getMany, removeMany, the transact op-handler, and
  db.with() overlays — with the caller's original key preserved under `_originalId`. The engine only
  ever sees a UUID; real UUIDs pass through untouched. universal/uuid.ts gains v5/v7/isUUID +
  BRAINY_ID_NAMESPACE; new utils/idNormalization.ts (coerceNewEntityId / resolveEntityId).
- aggregation min/max delete-safety: `queryAggregate` no longer leaves a stale min/max after
  deleting the current extreme — min/max now track a value multiset and recompute in-memory (no
  entity scan; that scan was the prior delete-then-hang a consumer reported). Other metrics were
  already exact across deletes. Regression test proves resolve-after-delete + correct new min/max.
- release.sh RC-safe: explicit version arg, prerelease detection (npm `--tag rc` + GitHub
  `--prerelease`), full `test:ci` gate (unit + integration), current-branch push, npm-access
  verification after publish.
- native-engine references point at `@soulcraft/cor` (8.0's partner) in user-facing strings/docs.

Unit 1461/0 · integration 599/0 · tsc clean.

tests/unit/brainy/update-reserved-metadata-remap.test.ts

@@ -252,7 +252,10 @@ describe('reserved-field metadata remap (8.0 contract)', () => {
 
       const entity = await speculative.get('spec-entity')
       expect(entity?.confidence).toBe(0.65)
-      expect(entity?.metadata).toEqual({ custom: 'spec' })
+      // 8.0 id normalization: a natural-key id is mapped to a stable UUID and
+      // the caller's original string is preserved under _originalId — surfaced
+      // here exactly as the durable transact()/add() paths do.
+      expect(entity?.metadata).toEqual({ custom: 'spec', _originalId: 'spec-entity' })
       await speculative.release()
       await base.release()
     })