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>

scripts/check-supply-chain-provider-fixtures.ts

@@ -12,7 +12,6 @@ import {
   readFile,
   readdir,
   rm,
-  symlink,
   writeFile,
 } from "node:fs/promises";
 import { tmpdir } from "node:os";
@@ -42,6 +41,7 @@ import {
   releaseCandidateManifestSchema,
 } from "./lib/release-candidate.ts";
 import { writeValidatedJsonArtifact } from "./lib/validated-json-artifact.ts";
+import { linkFixtureNodeModules } from "./lib/fixture-node-modules.ts";
 
 const repositoryRoot = process.cwd();
 const fixtureRoot = await mkdtemp(path.join(tmpdir(), "provider-exact-five-fixture-"));
@@ -59,7 +59,7 @@ try {
     recursive: true,
   });
   await rm(path.join(fixtureRoot, "artifacts/release"), { recursive: true, force: true });
-  await symlink(path.join(repositoryRoot, "node_modules"), path.join(fixtureRoot, "node_modules"), "dir");
+  await linkFixtureNodeModules(fixtureRoot, repositoryRoot);
   const git = spawnSync("git", ["show", "-s", "--format=%H%n%ct", "HEAD"], {
     cwd: repositoryRoot,
     encoding: "utf8",