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/application/ports/browser-transfer/resumable-upload.ts

@@ -40,6 +40,14 @@ export type UploadPartReceipt = UploadPartDescriptor &
     receiptToken: string;
   }>;
 
+export type PartitionDeleteOutcome =
+  | Readonly<{ state: "DELETED"; effect: "APPLIED" }>
+  | Readonly<{
+      state: "PENDING";
+      effect: "UNKNOWN";
+      reason: "BLOCKED_DEADLINE";
+    }>;
+
 export interface UploadRangeReader {
   readonly byteLength: number;
   readRange(input: Readonly<{
@@ -273,7 +281,13 @@ export interface ResumableUploadCheckpointAdmin {
    * Account/logout lifecycle operation for this already-bound opaque partition.
    * The adapter closes its connection before deletion and bounds blocked waits.
    */
+  /**
+   * BT-UP-03. An IndexedDB `deleteDatabase()` request cannot be cancelled once
+   * dispatched, so a blocked deadline is not evidence that nothing happened.
+   * `PENDING` reports the effect honestly as `UNKNOWN`; only pre-dispatch
+   * problems are ordinary failures.
+   */
   deletePartition(
     signal?: AbortSignal,
-  ): Promise<BrowserDataResult<Readonly<{ state: "DELETED" }>>>;
+  ): Promise<BrowserDataResult<PartitionDeleteOutcome>>;
 }