docs: mark superseded implementation plans

modules/apps/vehicle-history-app/src/test/java/com/lingniu/ingest/historyapp/MavenModuleProfileTest.java

@@ -569,6 +569,22 @@ class MavenModuleProfileTest {
         }
     }
 
+    @Test
+    void supersededImplementationPlansPointToCurrentArchitecture() throws Exception {
+        for (String path : List.of(
+                "docs/superpowers/plans/2026-06-23-gb32960-history-duckdb-hot-store.md",
+                "docs/superpowers/plans/2026-06-23-gb32960-service-split.md",
+                "docs/superpowers/plans/2026-06-29-vehicle-ingest-redesign-phase1.md")) {
+            String doc = Files.readString(repositoryRoot().resolve(path));
+
+            assertThat(doc)
+                    .as(path)
+                    .startsWith("> **Superseded:**")
+                    .contains("docs/target-architecture.md")
+                    .contains("docs/superpowers/specs/2026-06-29-vehicle-ingest-redesign.md");
+        }
+    }
+
     @Test
     void duckDbAndParquetAreNotPartOfTheCurrentBuildSurface() throws Exception {
         Document pom = rootPom();