feat(llm): mark compaction requests with x-deepseek-harness-compact header

packages/compact/compact-basic/src/summarizer.ts

@@ -138,6 +138,7 @@ export async function summarizeWithLlm(
     ...input.tools === undefined ? {} : { tools: [...input.tools] },
     maxTokens: config.maxTokens,
     sessionId: agent.session.id,
+    compact: true,
     ...signal === undefined ? {} : { signal },
   }
   for await (const chunk of ctx.llm.stream(options)) assembler.push(chunk)