fix: update config default and test to match nomic-v1.5 change

Author: github-actions[bot]

src/config.js

@@ -19,7 +19,7 @@ export const DEFAULTS = {
     defaultDepth: 3,
     defaultLimit: 20,
   },
-  embeddings: { model: 'jina-code', llmProvider: null },
+  embeddings: { model: 'nomic-v1.5', llmProvider: null },
   llm: { provider: null, model: null, baseUrl: null, apiKey: null, apiKeyCommand: null },
   search: { defaultMinScore: 0.2, rrfK: 60, topK: 15 },
   ci: { failOnCycles: false, impactThreshold: null },

tests/unit/config.test.js

@@ -55,7 +55,7 @@ describe('DEFAULTS', () => {
   });
 
   it('has embeddings defaults', () => {
-    expect(DEFAULTS.embeddings).toEqual({ model: 'jina-code', llmProvider: null });
+    expect(DEFAULTS.embeddings).toEqual({ model: 'nomic-v1.5', llmProvider: null });
   });
 
   it('has llm defaults', () => {