feat: agent self evolution (#2847)

* feat: add agent self-evolution

* fix ci

* delete unused doc

* fix lint

* fix evolution review issues

pkg/evolution/llm_timeout.go

@@ -0,0 +1,25 @@
+package evolution
+
+import (
+	"context"
+	"time"
+)
+
+const (
+	llmTaskSuccessJudgeTimeout = 15 * time.Second
+	llmPatternClusterTimeout   = 45 * time.Second
+	llmDraftGenerationTimeout  = 60 * time.Second
+)
+
+func withLLMCallTimeout(parent context.Context, timeout time.Duration) (context.Context, context.CancelFunc) {
+	if parent == nil {
+		parent = context.Background()
+	}
+	if timeout <= 0 {
+		return context.WithCancel(parent)
+	}
+	if deadline, ok := parent.Deadline(); ok && time.Until(deadline) <= timeout {
+		return context.WithCancel(parent)
+	}
+	return context.WithTimeout(parent, timeout)
+}