refactor(core): move database schema ownership (#29068)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

packages/core/test/catalog.test.ts

@@ -16,10 +16,8 @@ const locationLayer = Layer.succeed(
   Location.Service.of(location({ directory: AbsolutePath.make("test") })),
 )
 const it = testEffect(
-  Catalog.layer.pipe(
+  Catalog.locationLayer.pipe(
     Layer.provideMerge(EventV2.defaultLayer),
-    Layer.provideMerge(PluginV2.defaultLayer),
-    Layer.provideMerge(Policy.defaultLayer),
     Layer.provideMerge(locationLayer),
   ),
 )
@@ -166,6 +164,32 @@ describe("CatalogV2", () => {
     }),
   )
 
+  it.effect("ignores plugin additions from another location", () =>
+    Effect.gen(function* () {
+      const events = yield* EventV2.Service
+      const plugin = yield* PluginV2.Service
+      let invoked = 0
+
+      yield* plugin.add({
+        id: PluginV2.ID.make("test-transform"),
+        effect: Effect.succeed({
+          "catalog.transform": () => Effect.sync(() => invoked++),
+        }),
+      })
+      yield* Effect.yieldNow
+      expect(invoked).toBe(1)
+
+      yield* events.publish(
+        PluginV2.Event.Added,
+        { id: PluginV2.ID.make("test-transform") },
+        { location: { directory: AbsolutePath.make("other") } },
+      )
+      yield* Effect.yieldNow
+
+      expect(invoked).toBe(1)
+    }),
+  )
+
   it.effect("resolves provider and model option merges", () =>
     Effect.gen(function* () {
       const catalog = yield* Catalog.Service