feat(8.0): brain.fillSubtypes migration helper + pre-RC1 gap closure

- brain.fillSubtypes(rules): idempotent subtype back-fill for pre-8.0 data.
  One rule per NounType/VerbType (literal default or per-entry function);
  fills only entries still missing a subtype through the public update()/
  updateRelation() paths; returns { scanned, filled, skipped, errors, byType }.
  Full unit suite in tests/unit/brainy/fill-subtypes.test.ts.
- Fix getNouns/getVerbs pagination hasMore (peek one past the window) —
  was permanently false, silently truncating every multi-page walk.
- find({ near }) without near.id now throws a teaching error instead of an
  opaque storage sharding failure; CLI --threshold without --near applies a
  plain score floor.
- CLI init/close audit: every one-shot command init()s, close()s, and exits
  explicitly; delete the unmaintained interactive REPL; replace the cloud-era
  storage subcommands with status/batch-delete; new types/validate commands.
- requireSubtype JSDoc now documents the 8.0 default-on contract; audit()
  recommendation points at fillSubtypes.
- Docs: data-storage-architecture rewritten to the real 8.0 on-disk layout;
  README storage section reflects filesystem+memory and snapshots; eli5 and
  SEMANTIC_VFS /as-of/ semantics corrected; internal tracker IDs and
  .strategy references scrubbed from published files.

src/utils/paramValidation.ts

@@ -124,7 +124,8 @@ const getContainerMemoryLimit = (): number | null => {
  *   1.5 KB + standard fields + metadata). On a 900 MB free-memory box this
  *   capped `limit` at 9_000, breaking common safety-cap call patterns like
  *   `find({ type, where, limit: 10_000 })` that typically return 10-500
- *   entities. Surfaced as `BR-MAXLIMIT-9000` in PLATFORM-HANDOFF.md.
+ *   entities. Reported by a production consumer whose 10K safety-cap
+ *   queries started failing after the cap landed.
  * - 7.30.2+: `25` (assumes 25 KB per result). Generous over typical (7-10 KB),
  *   comfortably under the worst case (~20 KB with large metadata blobs).
  *   Same 900 MB box now gives ~36_000 — typical 10_000 limits pass silently,