feat(go-agent): Ported retrieval node, added Keenable web search tool (#16396)

Ported retrieval node, added Keenable web search tool
- [x] New Feature (non-breaking change which adds functionality)

internal/agent/workflowx/loop.go

@@ -24,7 +24,7 @@
 // a normal workflow node. See the .claude/plans/eino-workflow-loop.md
 // plan for the design rationale.
 //
-// Foundation for the canvas Loop component
+// # Foundation for the canvas Loop component
 //
 // AddLoopNode is also the runtime driver for the RAGFlow agent canvas's
 // "Loop" component (internal/agent/component/loop.go). The canvas engine
@@ -141,11 +141,11 @@ var (
 type LoopOption func(*loopOptions)
 
 type loopOptions struct {
-	maxIterations     int
-	compileOpts       []compose.GraphCompileOption
-	runOpts           []compose.Option
-	streamMode        LoopStreamMode
-	checkpointBuilder func(nodeKey string, iteration int) string
+	maxIterations       int
+	compileOpts         []compose.GraphCompileOption
+	runOpts             []compose.Option
+	streamMode          LoopStreamMode
+	checkpointBuilder   func(nodeKey string, iteration int) string
 	enableSubCheckpoint bool
 }
 
@@ -237,8 +237,8 @@ func defaultCheckpointBuilder(nodeKey string, iteration int) string {
 
 func getLoopOptions(opts []LoopOption) *loopOptions {
 	o := &loopOptions{
-		streamMode:        LoopStreamFinalOnly,
-		checkpointBuilder: defaultCheckpointBuilder,
+		streamMode:          LoopStreamFinalOnly,
+		checkpointBuilder:   defaultCheckpointBuilder,
 		enableSubCheckpoint: true,
 	}
 	for _, opt := range opts {
@@ -260,12 +260,12 @@ func getLoopOptions(opts []LoopOption) *loopOptions {
 // by the loop itself) sidesteps the need for callers to register
 // generic types with the schema package — see plan §"Type shape".
 type loopInterruptState struct {
-	Iteration       int                `json:"iteration"`
-	CurrentInput    []byte             `json:"current_input"`
-	StreamMode      LoopStreamMode     `json:"stream_mode"`
-	SubCheckpointID string             `json:"sub_checkpoint_id"`
-	SubCheckpoints  map[string][]byte  `json:"sub_checkpoints,omitempty"`
-	ReplayChunks    [][]byte           `json:"replay_chunks,omitempty"`
+	Iteration       int               `json:"iteration"`
+	CurrentInput    []byte            `json:"current_input"`
+	StreamMode      LoopStreamMode    `json:"stream_mode"`
+	SubCheckpointID string            `json:"sub_checkpoint_id"`
+	SubCheckpoints  map[string][]byte `json:"sub_checkpoints,omitempty"`
+	ReplayChunks    [][]byte          `json:"replay_chunks,omitempty"`
 }
 
 // AddLoopNode appends a loop node to the outer workflow `wf`. The
@@ -375,15 +375,15 @@ func loadLoopSnapshot[T any](ctx context.Context, defaultMode LoopStreamMode) (l
 	if streamMode == "" {
 		streamMode = defaultMode
 	}
-		return loopSnapshot{
-			startIteration: st.Iteration,
-			current:        st.CurrentInput,
-			streamMode:     streamMode,
-			subCheckID:     st.SubCheckpointID,
-			subCheckpoints: cloneCheckpointMap(st.SubCheckpoints),
-			replayChunks:   cloneByteSlices(st.ReplayChunks),
-		}, nil
-	}
+	return loopSnapshot{
+		startIteration: st.Iteration,
+		current:        st.CurrentInput,
+		streamMode:     streamMode,
+		subCheckID:     st.SubCheckpointID,
+		subCheckpoints: cloneCheckpointMap(st.SubCheckpoints),
+		replayChunks:   cloneByteSlices(st.ReplayChunks),
+	}, nil
+}
 
 // encodeState marshals a loop snapshot to the persisted form.
 func encodeState(s loopSnapshot) ([]byte, error) {