fix: harden AI analysis and seed defaults

modules/ai/server/analysis.test.ts

@@ -96,8 +96,6 @@ const runtimeConfig: AiRuntimeConfigResult = {
     baseUrl: "https://ai.example.test/v1",
     apiKey: "test-api-key",
     chatModel: "gpt-test",
-    embeddingModel: "embedding-test",
-    embeddingDimensions: 1536,
   },
 };
 
@@ -234,7 +232,7 @@ function createModelOutput(overrides: Partial<ElderAiAnalysisOutput> = {}): Elde
     modelSummary: {
       provider: "openai-compatible",
       chatModel: "gpt-test",
-      embeddingModel: "embedding-test",
+      knowledgeRetrieval: "keyword",
     },
     ...overrides,
   };
@@ -387,7 +385,7 @@ describe("elder AI analysis service", () => {
   it("degrades analysis when knowledge retrieval fails and records the retrieval audit failure", async () => {
     const database = createDatabaseFake();
     useDatabase(database);
-    vi.mocked(retrieveKnowledge).mockResolvedValue({ success: false, reason: "vector store unavailable", status: 500 });
+    vi.mocked(retrieveKnowledge).mockResolvedValue({ success: false, reason: "knowledge retrieval unavailable", status: 500 });
     chatMocks.invoke.mockResolvedValue(modelMessage(createModelOutput({ dataGaps: ["No gait score available."] })));
 
     const result = await generateElderAiAnalysis(createAuthContext(), "elder-1");