feat(namespace): NO SPECIAL NAMES + storage fidelity — the ruled completion of the field-addressing law

The write side of the law, ruled 2026-08-03: data is either in main space
where developers can use anything, or it is in system.*.

- The reserved-name write door DIES: add/update/relate/updateRelation
  metadata bags accept EVERY name (confidence, type, id, data, level,
  content, ...) as ordinary user fields — indexed, filterable, sortable,
  aggregatable, identical to any other field. The remap/enforce/warn
  machinery, the reservedFieldPolicy config (now a typed init refusal),
  and the compile-time metadata key bans are all removed. The one write
  refusal left: keys spelled 'system.*' (namespace forgery), now enforced
  on all four write doors.
- STORED RECORDS GO NESTED (v2): engine fields top-level, the user bag
  nested verbatim under 'metadata', sealed by a format stamp — by-name
  storage discrimination is unsound once colliders are admitted. Legacy
  flat records stay readable forever through the shape-aware splitters
  (sound for them: the old door refused colliders). Time travel rides the
  same split (generation store snapshots whole records).
- Name-based index exclusions DIE: user frame indexes every name; the
  excludeFields/indexedFields knobs and their silent-[] holes are gone;
  bulk-payload protection is value-shape only, uniform across names.
- Consumer-sweep findings fixed in the same wave: per-type counts read
  the frozen 'system.type' column (addToIndex sort, affinity tracking,
  cold-count rehydration, VFS type bitmaps — legacy 'noun' fallback for
  pre-rebuild reads); resolveHiddenIds addresses 'system.visibility'
  (bare 'visibility' was a silent no-op under the law — VFS/system
  entities leaked into default reads).
- Fidelity fallout fixed in the owning layers: readEntityFieldAddress
  reads the bag first (colliders were absent-shadowed by its own guard)
  and never serves system addresses from the bag; blob history refs read
  the bag shape-aware; migration transforms now receive ONE normalized
  view (engine fields + nested bag) regardless of stored era, and stray
  flat-habit keys refuse with the fix in the message.
- THE REOPEN-COLLIDER CONFORMANCE CASE (required before any RC counts as
  gates-green): all ten collider names + plumbing names written as user
  fields, verified verbatim + queryable across live reads, flush+reopen,
  a forced epoch rebuild, and asOf time travel; relation mirror; forgery
  refusals; legacy flat-record compat. 8/8 green.

Gates: unit 1901/1901 (exit 0) · integration 758 (exit 0) · conformance
27/27 (exit 0) · consumer test sweep migrated (10 files).

src/storage/baseStorage.ts

@@ -36,7 +36,8 @@ import { BrainyError, ProtectedArtifactError, DerivedArtifactMissingError } from
 import { MetadataWriteBuffer } from '../utils/metadataWriteBuffer.js'
 import {
   splitNounMetadataRecord,
-  splitVerbMetadataRecord
+  splitVerbMetadataRecord,
+  isNestedBagRecord
 } from '../types/reservedFields.js'
 
 /**
@@ -1013,8 +1014,14 @@ export abstract class BaseStorage extends BaseStorageAdapter {
     const hashes: string[] = []
     for (const record of records) {
       if (record.kind !== 'noun') continue
-      const storage = (record.metadata as { storage?: { type?: string; hash?: unknown } } | null)
-        ?.storage
+      // The VFS blob pointer (`storage: {type:'blob', hash}`) is a USER-bag
+      // field: in a v2 nested-bag record it lives inside `metadata`, in a
+      // legacy flat record it sits at the top level — read shape-aware.
+      const raw = record.metadata as Record<string, unknown> | null
+      const bag = isNestedBagRecord(raw)
+        ? (raw!.metadata as Record<string, unknown>)
+        : raw
+      const storage = (bag as { storage?: { type?: string; hash?: unknown } } | null)?.storage
       if (storage?.type === 'blob' && typeof storage.hash === 'string') {
         hashes.push(storage.hash)
       }