test(runtime): cast search's route-less discovery record, add changeset (#7939)

TS2339 on info.services.search.route: svcInProcess()'s return type carries
no route key at all, matching the same cast the #4318 cache/queue/job tests
already use. Re-measured @objectstack/runtime's TEST_DEBT at 227 (recorded),
unchanged.

Author: claude

.changeset/dispatcher-search-slot-handler-ready.md

@@ -0,0 +1,29 @@
+---
+"@objectstack/runtime": patch
+---
+
+fix(runtime): discovery no longer claims a bound handler for the `search` slot (#7939)
+
+`getDiscoveryInfo()`'s `services.search` entry reported `handlerReady: true` for
+any registered search-service occupant that carries no `__serviceInfo`
+self-description — even though the dispatcher has no `/search` route or handler
+at all (no `route-ledger.ts` entry, no branch in `http-dispatcher.ts`). That
+contradicted the map's own stated contract: `handlerReady: true` means "the
+dispatcher has a real, bound handler for this route."
+
+This is the same contradiction #4318 closed for `cache`/`queue`/`job`, applied
+to the one slot of that shape it did not reach. `search` now uses the same
+`svcInProcess()` remedy, reporting `handlerReady: false` for a filled slot —
+with its own message rather than the shared "Kernel-internal service" wording,
+since a registered search service is an external engine (Elasticsearch/
+Meilisearch), not a kernel-managed in-process contract.
+
+`capabilities.search` (the host's `/search` HTTP surface, fixed separately in
+#7602 / PR #7937) is untouched — this only corrects `services.search`, which
+describes what is *registered*, not what is served.
+
+Latent until now: nothing registers an `ISearchService` in either repository
+(`CORE_SERVICE_PROVIDER['search']` is `null`), so the wrong branch was never
+reachable in practice. Covered by two new fixture-filled tests that register a
+search occupant before asserting `handlerReady`, since an empty-slot test would
+pass regardless of what the line says.

packages/runtime/src/http-dispatcher.test.ts

@@ -3043,7 +3043,11 @@ describe('HttpDispatcher', () => {
             (kernel as any).services = new Map([['search', searchSvc]]);
 
             const info = await dispatcher.getDiscoveryInfo('/api/v1');
-            const reported = info.services.search;
+            // Cast like the #4318 cache/queue/job tests above: `svcInProcess`'s
+            // return type carries no `route` key at all (route-less by
+            // construction), so a direct `info.services.search.route` read
+            // does not typecheck against the narrowed union.
+            const reported = (info.services as Record<string, any>).search;
             expect(reported.enabled, 'services.search.enabled').toBe(true);
             expect(reported.status, 'services.search.status').toBe('available');
             expect(reported.handlerReady, 'services.search.handlerReady').toBe(false);