chore: sync the frontend template from a0fbafb to 5434760

Carries eight template commits: the provider sandbox actually running, release
admission to a named environment, the product feature manifest with its runtime
kill switch, architecture and documentation rules that match what is enforced,
the removability fixtures, and the browser, visual and performance evidence.

Product identity is unchanged. `package.json` keeps `tech-log-frontend` and the
catalog keeps the Tech Log naming; the home page was not in the delta. The
visual baselines are this product's own — the template's were excluded from the
transplant and these were regenerated here, where the only difference is the
platform overview's new product-feature section.

What this repository gains operationally: `config/runtime/{local,development,
staging,production}.json` with `FE-GATE-027` refusing an artifact whose runtime
document does not match the environment it is being admitted to, and
`FEATURE_OVERRIDES` for taking an installed feature out of service without a
rebuild.

Verified here: eight gates green, build green, visual 5/5, and 1,858 of 1,859
tests in the suites that do not need a sandbox — the one failure passes in
isolation and is a jsdom lazy-chunk timeout under parallel load. The provider
suites cannot run on this machine at all: `kernel.apparmor_restrict_unprivileged
_userns=1` makes `bwrap --unshare-net` fail, reproducible without any code from
either repository.

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

src/features/installed-feature-contracts.ts

@@ -4,7 +4,9 @@ import {
   composeSchemaRegistry,
   PLATFORM_SCHEMA_REGISTRY,
 } from "../contracts/schema-registry.ts";
-import { REFERENCE_FEATURE_CONTRACT } from "./reference-feature/contracts/reference-feature-contract.ts";
+import {
+  INSTALLED_PRODUCT_FEATURES,
+} from "./installed-product-manifest.ts";
 import {
   composeApiOperations,
   validateApiRuntimeBindings,
@@ -13,18 +15,27 @@ import { validateRestProfileBindings } from "../contracts/rest-profiles.ts";
 import { composeRuntimeSchemaCodecs } from "../contracts/schema-registry.ts";
 import { composeBoundaryMapperRegistry } from "../contracts/boundary-mapper.ts";
 
-export const INSTALLED_FEATURE_CONTRACTS = Object.freeze([
-  REFERENCE_FEATURE_CONTRACT,
-]);
+/**
+ * §3.5. Composed from the product manifest rather than from a literal list, so
+ * a feature the build did not select contributes no routes, no operations, no
+ * schemas and no messages — and is therefore not reachable from any registry.
+ */
+export const INSTALLED_FEATURE_CONTRACTS = INSTALLED_PRODUCT_FEATURES;
 
-export const ROUTE_REGISTRY = Object.freeze({
-  ...PLATFORM_ROUTE_REGISTRY,
-  ...REFERENCE_FEATURE_CONTRACT.routes,
-});
-export const ROUTE_RUNTIME_CONTRACT = Object.freeze({
-  ...PLATFORM_ROUTE_RUNTIME_CONTRACT,
-  ...REFERENCE_FEATURE_CONTRACT.routeRuntimeContracts,
-});
+export const ROUTE_REGISTRY = Object.freeze(
+  INSTALLED_FEATURE_CONTRACTS.reduce(
+    (registry, contract) => ({ ...registry, ...contract.routes }),
+    { ...PLATFORM_ROUTE_REGISTRY },
+  ),
+) as typeof PLATFORM_ROUTE_REGISTRY &
+  (typeof INSTALLED_PRODUCT_FEATURES)[number]["routes"];
+export const ROUTE_RUNTIME_CONTRACT = Object.freeze(
+  INSTALLED_FEATURE_CONTRACTS.reduce(
+    (registry, contract) => ({ ...registry, ...contract.routeRuntimeContracts }),
+    { ...PLATFORM_ROUTE_RUNTIME_CONTRACT },
+  ),
+) as typeof PLATFORM_ROUTE_RUNTIME_CONTRACT &
+  (typeof INSTALLED_PRODUCT_FEATURES)[number]["routeRuntimeContracts"];
 export const API_OPERATIONS = composeApiOperations(
   INSTALLED_FEATURE_CONTRACTS.map((contract) => contract.apiOperations),
 );
@@ -69,6 +80,24 @@ export const API_RUNTIME_BINDINGS_VALID = validateApiRuntimeBindings(
   MAPPER_REGISTRY,
 );
 
+/**
+ * §3.5. Which feature owns each route.
+ *
+ * A route contributed by a feature disappears with it at build time, and has to
+ * be withdrawn from navigation and from the router when the runtime document
+ * disables that feature. Platform routes have no owner and are always present.
+ */
+export const ROUTE_FEATURE_OWNER: Readonly<Record<string, string>> =
+  Object.freeze(
+    Object.fromEntries(
+      INSTALLED_FEATURE_CONTRACTS.flatMap((contract) =>
+        Object.keys(contract.routes).map(
+          (routeId) => [routeId, contract.featureId] as const,
+        ),
+      ),
+    ),
+  );
+
 export const NAVIGATION_ROUTES = Object.freeze(
   Object.values(ROUTE_REGISTRY)
     .filter(isNavigableRoute)