fix(spec): correct the at-rest clause on the D3 filter entry — --stored does exist

The entry said "no author runs `os migrate meta` over `sys_metadata`". That is false:
`os migrate meta --stored` has exactly that subject (packages/cli/src/commands/migrate/
meta.ts — module doc "`--stored`: the same chain, over data at rest", the flag, `runStored`,
`protocol.migrateStoredMetadata(...)`).

The true and narrower fact the clause was reaching for: the stored pass replays ADR-0087 D2
conversions only — `migrateStoredMetadata` converts through `applyConversionsToStoredItem`,
i.e. `applyConversions`, and emits no D3 TODOs (`todos` is 7x in the authored-mode half of
meta.ts and 0x from `runStored` to EOF) — so with no D2 conversion added by this disposition
it has nothing to rewrite for this shape.

The scoped "this disposition adds no D2 conversion" is unchanged and stays scoped: the
partial-D2 direction question is the ruler's, not this entry's.

`registry.ts` follows by `gen:migration-registry`; no other sentence of the entry moved.

Claude-Session: https://claude.ai/code/session_01MkQhmuuJAVDjmeWNixwDDH
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/spec/src/migrations/entries/semantic/18.element-data-source-and-object-block-filter-rule-array.ts

@@ -58,8 +58,10 @@ export const entry: SemanticMigration = {
     + 'in the same change, and zero outside those files; this entry carries the prescription '
     + 'for authors outside the repo. '
     + '⚠️ Metadata AT REST is deliberately NOT rewritten, and this disposition adds no D2 '
-    + 'conversion — a SemanticMigration converts nothing by its own type, and no author runs '
-    + '`os migrate meta` over `sys_metadata`. The read path does not re-validate stored rows '
+    + 'conversion — a SemanticMigration converts nothing by its own type, and '
+    + '`os migrate meta --stored` (the pass over a deployment\'s `sys_metadata` rows) replays '
+    + 'D2 conversions only, so it has nothing to rewrite here. The read path does not '
+    + 're-validate stored rows '
     + '(`applyConversionsToStoredItem` replays the full chain without validating, by its own '
     + 'contract), so a stored page or block carrying the record form keeps loading unchanged '
     + 'and is still rendered by objectui at the pinned `.objectui-sha`; what changes is that '

packages/spec/src/migrations/registry.ts

@@ -6949,8 +6949,10 @@ const step18: MigrationStep = {
         + 'in the same change, and zero outside those files; this entry carries the prescription '
         + 'for authors outside the repo. '
         + '⚠️ Metadata AT REST is deliberately NOT rewritten, and this disposition adds no D2 '
-        + 'conversion — a SemanticMigration converts nothing by its own type, and no author runs '
-        + '`os migrate meta` over `sys_metadata`. The read path does not re-validate stored rows '
+        + 'conversion — a SemanticMigration converts nothing by its own type, and '
+        + '`os migrate meta --stored` (the pass over a deployment\'s `sys_metadata` rows) replays '
+        + 'D2 conversions only, so it has nothing to rewrite here. The read path does not '
+        + 're-validate stored rows '
         + '(`applyConversionsToStoredItem` replays the full chain without validating, by its own '
         + 'contract), so a stored page or block carrying the record form keeps loading unchanged '
         + 'and is still rendered by objectui at the pinned `.objectui-sha`; what changes is that '