feat(runtime): add process watch patterns, unified backup/import, pluggable context engine, token usage, and codex device login

pkg/agent/context_engine.go

@@ -0,0 +1,55 @@
+package agent
+
+import "github.com/YspCoder/clawgo/pkg/providers"
+
+// ContextBuildRequest defines inputs for building a provider message window.
+type ContextBuildRequest struct {
+	History          []providers.Message
+	Summary          string
+	CurrentMessage   string
+	Media            []string
+	Channel          string
+	ChatID           string
+	ResponseLanguage string
+	MemoryNamespace  string
+}
+
+// ContextEngine allows swapping context-assembly behavior without touching AgentLoop flow.
+type ContextEngine interface {
+	BuildMessages(req ContextBuildRequest) []providers.Message
+	SkillsInfo() map[string]interface{}
+}
+
+type defaultContextEngine struct {
+	builder *ContextBuilder
+}
+
+func NewDefaultContextEngine(builder *ContextBuilder) ContextEngine {
+	if builder == nil {
+		return nil
+	}
+	return &defaultContextEngine{builder: builder}
+}
+
+func (e *defaultContextEngine) BuildMessages(req ContextBuildRequest) []providers.Message {
+	if e == nil || e.builder == nil {
+		return nil
+	}
+	return e.builder.BuildMessagesWithMemoryNamespace(
+		req.History,
+		req.Summary,
+		req.CurrentMessage,
+		req.Media,
+		req.Channel,
+		req.ChatID,
+		req.ResponseLanguage,
+		req.MemoryNamespace,
+	)
+}
+
+func (e *defaultContextEngine) SkillsInfo() map[string]interface{} {
+	if e == nil || e.builder == nil {
+		return map[string]interface{}{}
+	}
+	return e.builder.GetSkillsInfo()
+}