fix: harden model catalog projections

backend/src/workspaces/effective-config.ts

@@ -140,7 +140,7 @@ function buildEmbeddingConfig(rendered: Record<string, unknown>): CanonicalEmbed
   }
   const model = requireString(embeddings, "model");
   return {
-    id: `ollama/${model}`,
+    id: optionalString(embeddings, "id") ?? `ollama/${model}`,
     model,
     dimensions: requireNumber(embeddings, "dimensions"),
   };

backend/src/workspaces/runtime-renderer.ts

@@ -274,6 +274,8 @@ export function renderRuntimeConfig(
       },
       embedding: {
         provider: "ollama_internal",
+        id: semanticRuntime.internalEmbeddingId
+          ?? `ollama/${semanticRuntime.internalEmbeddingModel}`,
         model: semanticRuntime.internalEmbeddingModel,
         dimensions: semanticRuntime.internalEmbeddingDimensions,
       },
@@ -287,6 +289,8 @@ export function renderRuntimeConfig(
       embeddings: {
         provider: "ollama_internal",
         base_url: semanticRuntime.internalEmbeddingUrl,
+        id: semanticRuntime.internalEmbeddingId
+          ?? `ollama/${semanticRuntime.internalEmbeddingModel}`,
         model: semanticRuntime.internalEmbeddingModel,
         dimensions: semanticRuntime.internalEmbeddingDimensions,
       },