fix: preserve transport cause diagnostics

packages/llm/llm-deepseek/src/adapter.ts

@@ -57,10 +57,6 @@ function requestId(headers: Headers): ReturnType<typeof ProviderRequestId> | und
   return value === null || value.length === 0 ? undefined : ProviderRequestId(value)
 }
 
-function errorMessage(value: unknown): string {
-  return value instanceof Error ? value.message : String(value)
-}
-
 /**
  * Map an HTTP status to a stable LlmError code.
  * @param status - status of a non-2xx provider response.
@@ -144,7 +140,7 @@ export class DeepSeekAdapter extends LlmAdapter {
         throw new LlmError('DeepSeek request aborted by caller', 'ABORTED', { cause: error })
       }
       if (error instanceof LlmError) throw error
-      throw new LlmError(`DeepSeek transport failed: ${errorMessage(error)}`, 'TRANSPORT', { cause: error })
+      throw new LlmError(`DeepSeek API stream from ${this.options.baseURL} failed`, 'TRANSPORT', { cause: error })
     } finally {
       consumer.abort('DeepSeek stream consumer stopped')
       if (!exhausted && iterator.return !== undefined) {

packages/llm/llm-deepseek/tests/adapter.spec.ts

@@ -373,14 +373,20 @@ describe('DeepSeekAdapter against a mock server', () => {
     }
   })
 
-  it('rejects with STREAM_CLOSED when the server drops mid-stream', async () => {
+  it('classifies an abrupt body close as TRANSPORT and retains its cause', async () => {
     const server = await mockServer([{
       kind: 'close-early',
       events: ['{"choices":[{"delta":{"content":"par"}}]}'],
     }])
     const ctx = await harness(server.url)
-    await expect(assemble(ctx,{ model: 'deepseek-v4-flash', messages: [] }))
-      .rejects.toThrow(/terminated|socket|without \[DONE\]/)
+    let caught: unknown
+    try {
+      await assemble(ctx,{ model: 'deepseek-v4-flash', messages: [] })
+    } catch (error: unknown) {
+      caught = error
+    }
+    expect(caught).toMatchObject({ code: 'TRANSPORT' })
+    expect(errorChain(caught)).toMatch(/terminated|socket|without \[DONE\]/)
   })
 
   it('aborts mid-stream via the request signal', async () => {