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).

tests/integration/fact-log-dual-write.test.ts

@@ -11,7 +11,7 @@ import { describe, it, expect, beforeEach, afterEach } from 'vitest'
 import * as fs from 'node:fs'
 import * as os from 'node:os'
 import * as path from 'node:path'
-import { Brainy, ProtectedArtifactError, type CommitFact } from '../../src/index.js'
+import { Brainy, ProtectedArtifactError, splitNounMetadataRecord, type CommitFact } from '../../src/index.js'
 
 async function allFacts(brain: any): Promise<CommitFact[]> {
   const scan = brain.scanFacts()
@@ -65,7 +65,13 @@ describe('fact log dual-write (memory adapter)', () => {
     const updateFact = facts[facts.length - 1]
     const op = updateFact.ops.find((o) => o.id === id)!
     expect(op.record).not.toBeNull()
-    expect((op.record!.metadata as any).v).toBe('new')
+    // The fact log is byte-faithful: op.record.metadata is the RAW stored
+    // record (v2 nested-bag since the field-addressing law) — read the user
+    // field through the shape-aware split, like every other reader.
+    const { custom } = splitNounMetadataRecord(
+      op.record!.metadata as Record<string, unknown>
+    )
+    expect(custom.v).toBe('new')
   })
 
   it('a transact commits ONE fact carrying all its ops, with meta', async () => {