chore: sync the frontend template from 4dc033c to 8157ad4

The product was materialized from the template at `4dc033c` and has stayed
on it through 43 template commits, so it was missing all three rounds of
adapter remediation — including files it never had, such as the shared
`abortable-operation` primitive and the `exact-snapshot` decoder that
later fixes are written against. Taking only the newest round was not
possible for that reason: the delta is coherent only as a whole.

The product had not touched `src/adapters` at all since materialization,
so the 140-file delta applied with a three-way merge and no conflicts.
`package.json` was the single overlap and merged cleanly: the product owns
`name`, the template contributed `check:adapter-inventory`,
`check:remediation-ledger` and the image-resolve-signal type fixture.
All 24 product-owned files — README, index.html, CI workflow, i18n
catalog, home page, generated schemas, evidence scripts, component and
visual snapshots — are byte-identical to `main`.

`template.lock.json` now pins the synced revision and tree.

Verified in this repository, not inherited from the template: six type
projects, lint, nine gates (adapter inventory, remediation ledger,
registries, diagnostics, realtime boundaries, architecture, browser
file/storage boundaries, optional recipes, documentation), the production
build, and 2,054 of 2,073 tests. The 19 failures are all in
`tests/unit/ci-artifact-contract.test.ts` and are the same pre-existing
sandbox RLIMIT, EMFILE, umask and `/tmp` permission behaviour the template
records; four suites that failed once under parallel load pass in
isolation.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/adapters/storage/opfs/indexeddb-opfs-journal.ts

@@ -1650,12 +1650,26 @@ function isChunkReference(
   );
 }
 
+/**
+ * STO-01 expand phase. v1 prepared objects stay readable through the rollback
+ * window; v2 additionally carries a transaction-unique physical fencing token.
+ */
+function isSupportedPhysicalSchema(value: object): boolean {
+  const record = value as Record<string, unknown>;
+  if (record.physicalSchemaVersion === 1) return true;
+  return (
+    record.physicalSchemaVersion === 2 &&
+    typeof record.physicalGenerationId === "string" &&
+    /^[0-9a-f]{32}$/u.test(record.physicalGenerationId)
+  );
+}
+
 function isPreparedObject(value: unknown): value is OpfsPreparedObject {
   if (
     !value ||
     typeof value !== "object" ||
     !("physicalSchemaVersion" in value) ||
-    value.physicalSchemaVersion !== 1 ||
+    !isSupportedPhysicalSchema(value) ||
     !("descriptor" in value) ||
     !value.descriptor ||
     typeof value.descriptor !== "object" ||