fix(distill): max_tokens 800→1200 — Agnes推理token预算不足

Agnes 2.0-flash是推理模型，推理token占大量预算。
800仍不够→JSON截断(parse error: unexpected end of JSON input)。
1200确保推理+正文都够用。

go/internal/distill/consolidate.go

@@ -184,7 +184,7 @@ func (e *Engine) ConsolidateMemory(target MemoryCandidate, candidates []MemoryCa
 		"model":       e.LLMModel,
 		"messages":    []map[string]string{{"role": "user", "content": prompt}},
 		"temperature": 0.1,
-		"max_tokens":  800,
+		"max_tokens":  1200,
 	}
 	jsonBody, err := json.Marshal(body)
 	if err != nil {

go/internal/distill/engine.go

@@ -339,7 +339,7 @@ func (e *Engine) callLLM5D(content string) (LLMResponse, error) {
 			{"role": "user", "content": prompt},
 		},
 		"temperature": 0.2,
-		"max_tokens":  800,
+		"max_tokens":  1200,
 	}
 
 	jsonBody, err := json.Marshal(body)