refactor(llm): classify auxiliary request purpose

packages/llm/llm-deepseek/README.md

@@ -38,7 +38,7 @@ The plugin registers the single provider route `deepseek`. A request selects it
 
 ## App attribution
 
-Every request carries the shared attribution header from dsh-llm's `attributionHeaders()` - the mandatory `User-Agent` baseline identifying the harness (see [dsh-llm § App attribution](../llm/README.md#app-attribution-attributionts)). Direct DeepSeek requests and OpenAI-compatible gateway requests get no provider-specific app-attribution headers under this adapter contract; OpenRouter app attribution is deferred to a future explicit OpenRouter adapter or mode. A request with `GenerateOptions.compact` set (dsh-compact-basic's auxiliary summarization call) additionally carries `x-deepseek-harness-compact: 1`, so the host can separate compaction traffic from conversation requests.
+Every request carries the shared attribution header from dsh-llm's `attributionHeaders()` - the mandatory `User-Agent` baseline identifying the harness (see [dsh-llm § App attribution](../llm/README.md#app-attribution-attributionts)). Direct DeepSeek requests and OpenAI-compatible gateway requests get no provider-specific app-attribution headers under this adapter contract; OpenRouter app attribution is deferred to a future explicit OpenRouter adapter or mode. A request whose `GenerateOptions.purpose` is `compaction` (dsh-compact-basic's auxiliary summarization call) additionally carries `x-deepseek-harness-compact: 1`, so the host can separate compaction traffic from conversation requests.
 
 ## Wire-format notes (verified live + against the official docs)
 

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

@@ -182,7 +182,7 @@ export class DeepSeekAdapter extends LlmAdapter {
       ...options.sessionId !== undefined
         ? { 'x-deepseek-harness-session-id': String(options.sessionId) }
         : {},
-      ...options.compact === true
+      ...options.purpose === 'compaction'
         ? { 'x-deepseek-harness-compact': '1' }
         : {},
     }

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

@@ -129,7 +129,6 @@ describe('DeepSeekAdapter against a mock server', () => {
     expect(server.headers[0]).not.toHaveProperty('http-referer')
     expect(server.headers[0]).not.toHaveProperty('x-openrouter-title')
     expect(server.headers[0]).not.toHaveProperty('x-openrouter-categories')
-    // A conversation request carries no compaction marker.
     expect(server.headers[0]).not.toHaveProperty('x-deepseek-harness-compact')
   })
 
@@ -168,7 +167,7 @@ describe('DeepSeekAdapter against a mock server', () => {
     await assemble(ctx, {
       model: 'deepseek-v4-flash',
       messages: [{ role: 'user', content: [{ type: 'text', text: 'hi' }] }],
-      compact: true,
+      purpose: 'compaction',
     })
 
     expect(server.headers[0]?.['x-deepseek-harness-compact']).toBe('1')