feat: agent self evolution (#2847)

* feat: add agent self-evolution

* fix ci

* delete unused doc

* fix lint

* fix evolution review issues

pkg/evolution/paths.go

@@ -0,0 +1,35 @@
+package evolution
+
+import (
+	"path/filepath"
+	"strings"
+)
+
+type Paths struct {
+	Workspace       string
+	RootDir         string
+	LearningRecords string
+	TaskRecords     string
+	PatternRecords  string
+	SkillDrafts     string
+	ProfilesDir     string
+	BackupsDir      string
+}
+
+func NewPaths(workspace, override string) Paths {
+	root := strings.TrimSpace(override)
+	if root == "" {
+		root = filepath.Join(workspace, "state", "evolution")
+	}
+
+	return Paths{
+		Workspace:       workspace,
+		RootDir:         root,
+		LearningRecords: filepath.Join(root, "learning-records.jsonl"),
+		TaskRecords:     filepath.Join(root, "task-records.jsonl"),
+		PatternRecords:  filepath.Join(root, "pattern-records.jsonl"),
+		SkillDrafts:     filepath.Join(root, "skill-drafts.json"),
+		ProfilesDir:     filepath.Join(root, "profiles"),
+		BackupsDir:      filepath.Join(root, "backups"),
+	}
+}