cmd/storage-migrate/main.go

@@ -290,7 +290,7 @@ var copyOrder = []string{
 	"memory_entries", "audit_events", "pending_confirms", "llm_usage_daily",
 	"secret_keys", "settings_snapshots", "regen_pending", "context_entries",
 	"user_commands", "pending_notices", "recovery_holds",
-	"surfaces", "surface_revisions", "plugin_activation",
+	"surfaces", "surface_revisions", "surface_actions", "plugin_activation",
 }
 
 const controlDDL = `

internal/app/app.go

@@ -516,6 +516,17 @@ func Run(opt Options) error {
 
 	// 命令总线（提案 T3/D27/D30）：四入口同源分发 + 审计 + 危险内联确认卡。
 	bus := cmdbus.New(st, cardSvc, func() time.Time { return time.Now().UTC() })
+	// U5：页面动作分发口——surfacesvc.SubmitAction 经命令总线四入口同源分发
+	//（审计信封、参数校验、DangerHigh 内联确认卡全复用；Confirmed 不透传）。
+	surfaceSvc.SetDispatcher(func(ctx context.Context, d surfacesvc.ActionDispatch) (surfacesvc.ActionOutcome, error) {
+		resp := bus.Dispatch(ctx, cmdbus.Request{ID: d.CommandID, Params: d.Params,
+			Entrance: "button", Owner: d.Owner, ConversationID: d.ConversationID})
+		state := "committed"
+		if resp.Receipt.State != "" {
+			state = string(resp.Receipt.State)
+		}
+		return surfacesvc.ActionOutcome{State: state, CardID: resp.Card.ID, Receipt: resp.Receipt, Payload: resp.Payload}, nil
+	})
 	// U3：generative-ui 工具注入闸——activation 台账关闭时命令不投影给该 owner
 	// 的模型（禁用即不注入能力；执行端守卫仍在 surfacesvc）。
 	bus.SetToolGate(func(owner, commandID string) bool {

internal/genui/genui.go

@@ -17,8 +17,13 @@ import (
 // PluginID 是插件身份（activation 台账与命令前缀共用）。
 const PluginID = "generative-ui"
 
-// CommandPresent 是唯一提交命令 id（revise 即带 surfaceId+baseRevision 的再次 present）。
-const CommandPresent = PluginID + ".present"
+const (
+	// CommandPresent 是页面提交命令（revise 即带 surfaceId+baseRevision 的再次 present）。
+	CommandPresent = PluginID + ".present"
+	// CommandSubmit 是 U5 已批准的唯页面动作（C 类：表单数据落插件 KV 台账；
+	// 不 exposeAsTool——按钮专用，模型不可直接调用）。
+	CommandSubmit = PluginID + ".submit"
+)
 
 // Catalog 是组件目录与纪律（U1 试验 CATALOG_PROMPT 的 Go 权威版；工具描述携带，
 // 模型与校验器看到同一份规则）。修改需同步 core.ValidateSurfaceSpec 与目录版本。
@@ -37,6 +42,8 @@ tabs{tabs:{tabs:[{id,label,nodes?}],active?}}；timeline{timeline:{items:[{title
 分析/建议只放 markdown 且不加 source；≤200 节点、≤8 层、≤256KiB；未知类型/字段与未知
 doc-ref 会被拒绝并返回字段级错误（可修正后重提一次）。结构服务目标：比较→compare/table；
 风险→按严重度组织；顺序→steps/timeline；收集输入→form。
+actions 节点纪律：action 的 id 当前仅允许 "generative-ui.submit"（表单提交，携带整页表单草稿）；
+引用其他 action id 会被拒绝；按钮点击由用户发起，宿主经命令总线分发并审计。
 最小完整示例（spec 参数的形状；title 与 nodes 在顶层，source 挂在节点上）：
 {"title":"示例页","nodes":[
  {"type":"section","id":"n1","title":"结论","children":[
@@ -68,7 +75,87 @@ func register(reg extension.Registry) error {
 		},
 		"exposeAsTool": {"risk": "low"}
 	}`, CommandPresent, "提交一页声明式页面（由宿主校验、保存并在预览区渲染）。"+Catalog))
-	return reg.AddCommandHandler(spec, present)
+	if err := reg.AddCommandHandler(spec, present); err != nil {
+		return err
+	}
+	submitSpec := json.RawMessage(`{
+		"id": "generative-ui.submit",
+		"title": "提交表单",
+		"description": "页面动作：提交用户填写的表单数据（落插件台账；按钮触发，不经模型）",
+		"paramsSchema": {
+			"type": "object",
+			"properties": {
+				"surfaceId": {"type": "string"},
+				"revision": {"type": "integer"},
+				"requestId": {"type": "string"},
+				"data": {"type": "object"}
+			},
+			"required": ["surfaceId", "requestId", "data"]
+		}
+	}`)
+	return reg.AddCommandHandler(submitSpec, submitForm)
+}
+
+// submitForm 是 C 类动作处理器：表单数据落插件自有 KV 台账（键含 requestId
+// 天然幂等；已批准范围限定 KV+任务台账，不建业务事实表）。经命令总线四入口
+// 同源：审计信封与（若未来升档）高危确认卡由总线收口。
+func submitForm(ctx context.Context, h extension.Host, req extension.Request) (any, error) {
+	surfaceID, _ := req.Params["surfaceId"].(string)
+	requestID, _ := req.Params["requestId"].(string)
+	if surfaceID == "" || requestID == "" {
+		return nil, fmt.Errorf("generative-ui.submit: surfaceId and requestId required")
+	}
+	data, _ := json.Marshal(req.Params["data"])
+	key := "form:" + surfaceID + ":" + requestID
+	if err := h.KVPut(key, string(data)); err != nil {
+		return nil, err
+	}
+	if err := h.Audit("surface.form_submitted", surfaceID, "requestId="+requestID+" bytes="+fmt.Sprint(len(data))); err != nil {
+		return nil, err
+	}
+	return map[string]any{"ok": true, "stored": true, "key": key}, nil
+}
+
+// ValidateActionIDs 供 present 校验：actions 节点引用的 id 必须在已开放集合内。
+func ValidateActionIDs(spec []byte) []string {
+	var s struct {
+		Nodes []core.UINode `json:"nodes"`
+	}
+	if err := json.Unmarshal(spec, &s); err != nil {
+		return nil
+	}
+	var errs []string
+	var walk func(n core.UINode, path string)
+	walk = func(n core.UINode, path string) {
+		if n.Type == core.UIActions {
+			for _, a := range n.Actions {
+				if a.ID != CommandSubmit {
+					errs = append(errs, fmt.Sprintf("%s: 未知动作 id %q（当前仅允许 %s）", path, a.ID, CommandSubmit))
+				}
+			}
+		}
+		for i, c := range n.Children {
+			walk(c, fmt.Sprintf("%s/child[%d]", path, i))
+		}
+		if n.Compare != nil {
+			for side, sd := range map[string]core.UICompareSide{"left": n.Compare.Left, "right": n.Compare.Right} {
+				for i, c := range sd.Nodes {
+					walk(c, fmt.Sprintf("%s/%s[%d]", path, side, i))
+				}
+			}
+		}
+		if n.Tabs != nil {
+			for i, tb := range n.Tabs.Tabs {
+				for j, c := range tb.Nodes {
+					walk(c, fmt.Sprintf("%s/tab[%d][%d]", path, i, j))
+				}
+			}
+		}
+	}
+	for i, n := range s.Nodes {
+		walk(n, fmt.Sprintf("$[%d]", i))
+	}
+	return errs
 }
 
 // present 是命令处理器：经 owner 作用域 Host 的 SurfaceHost 能力提交页面。
@@ -98,6 +185,10 @@ func present(ctx context.Context, h extension.Host, req extension.Request) (any,
 	if errs := authorizeDocRefs(raw, h); len(errs) > 0 {
 		return toolError("invalid spec", errs), nil
 	}
+	// 动作白名单（U5 已批准范围）：未知动作 id 拒绝并回字段级错误。
+	if errs := ValidateActionIDs(raw); len(errs) > 0 {
+		return toolError("invalid spec", errs), nil
+	}
 	snap, err := sh.SurfaceSave(ctx, extension.SurfaceSaveRequest{
 		SurfaceID:      core.ID(surfaceID),
 		ConversationID: core.ID(req.ConversationID),

internal/genui/genui_test.go

@@ -162,36 +162,58 @@ func TestPresentSubmitCarriesEpochAndRevises(t *testing.T) {
 }
 
 func TestRegisterSpecShape(t *testing.T) {
-	var captured json.RawMessage
-	reg := &fakeRegistry{capture: &captured}
+	var captured []json.RawMessage
+	reg := &fakeRegistry{captureList: &captured}
 	if err := register(reg); err != nil {
 		t.Fatal(err)
 	}
+	byID := map[string]json.RawMessage{}
+	for _, raw := range captured {
+		var id struct {
+			ID string `json:"id"`
+		}
+		if err := json.Unmarshal(raw, &id); err != nil {
+			t.Fatal(err)
+		}
+		byID[id.ID] = raw
+	}
 	var spec struct {
 		ID           string         `json:"id"`
 		Description  string         `json:"description"`
 		ExposeAsTool map[string]any `json:"exposeAsTool"`
-		ParamsSchema map[string]any `json:"paramsSchema"`
 	}
-	if err := json.Unmarshal(captured, &spec); err != nil {
+	if raw, ok := byID[CommandPresent]; !ok {
+		t.Fatalf("present command not registered: %v", captured)
+	} else if err := json.Unmarshal(raw, &spec); err != nil {
 		t.Fatal(err)
 	}
 	if spec.ID != CommandPresent || spec.ExposeAsTool == nil {
-		t.Fatalf("spec must expose as tool: %s", captured)
+		t.Fatalf("present must expose as tool: %s", byID[CommandPresent])
 	}
-	for _, need := range []string{"section{", "compare{", "steps{", "≤200 节点"} {
+	for _, need := range []string{"section{", "compare{", "steps{", "≤200 节点", "generative-ui.submit"} {
 		if !strings.Contains(spec.Description, need) {
 			t.Fatalf("catalog incomplete: missing %q", need)
 		}
 	}
+	var submit struct {
+		ExposeAsTool map[string]any `json:"exposeAsTool"`
+	}
+	if raw, ok := byID[CommandSubmit]; !ok {
+		t.Fatalf("submit command not registered: %v", captured)
+	} else {
+		_ = json.Unmarshal(raw, &submit)
+		if submit.ExposeAsTool != nil {
+			t.Fatal("submit must NOT expose as tool (button-only; model cannot call)")
+		}
+	}
 }
 
 type plainHost struct{ extension.Host }
 
-type fakeRegistry struct{ capture *json.RawMessage }
+type fakeRegistry struct{ captureList *[]json.RawMessage }
 
 func (r *fakeRegistry) AddCommandHandler(spec json.RawMessage, h extension.Handler) error {
-	*r.capture = spec
+	*r.captureList = append(*r.captureList, spec)
 	return nil
 }
 func (r *fakeRegistry) AddSkill(name, markdown string) error            { return nil }
@@ -201,3 +223,60 @@ func (r *fakeRegistry) RegisterResourceAuthorizer(fn extension.ResourceAuthorize
 	return nil
 }
 func (r *fakeRegistry) AddIntent(spec json.RawMessage) error { return nil }
+
+func TestPresentRejectsUnknownActionIDs(t *testing.T) {
+	newRealSvc(t)
+	ctx := context.Background()
+	h := &fakeHost{enabled: true, epoch: 1, artifacts: map[string]bool{}}
+	spec := map[string]any{"title": "t", "nodes": []any{map[string]any{
+		"type": "actions", "id": "a1",
+		"actions": []any{
+			map[string]any{"id": "shell.exec", "label": "危险"},
+			map[string]any{"id": "generative-ui.submit", "label": "提交"},
+		}}}}
+	res, err := present(ctx, h, reqWith(spec))
+	if err != nil {
+		t.Fatalf("should be tool error, got %v", err)
+	}
+	te, ok := res.(toolErrorBody)
+	if !ok || te.OK || len(te.Details) == 0 {
+		t.Fatalf("expected field errors, got %+v", res)
+	}
+	if !strings.Contains(strings.Join(te.Details, ";"), "shell.exec") {
+		t.Fatalf("errors should name the unknown action: %+v", te)
+	}
+}
+
+func TestSubmitFormStoresLedger(t *testing.T) {
+	// C 类：表单数据落插件 KV 台账（键含 requestId 天然幂等）。
+	var kv map[string]string = map[string]string{}
+	h := &ledgerHost{kv: kv}
+	res, err := submitForm(context.Background(), h, extension.Request{Params: map[string]any{
+		"surfaceId": "surf_x", "requestId": "req-1", "revision": float64(1),
+		"data": map[string]any{"years": "5"},
+	}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	m, _ := res.(map[string]any)
+	if m["ok"] != true || m["stored"] != true {
+		t.Fatalf("submit result: %+v", m)
+	}
+	if v, ok := kv["form:surf_x:req-1"]; !ok || !strings.Contains(v, `"years":"5"`) {
+		t.Fatalf("ledger missing data: %v", kv)
+	}
+	// 幂等重放同键覆盖同值
+	if _, err := submitForm(context.Background(), h, extension.Request{Params: map[string]any{
+		"surfaceId": "surf_x", "requestId": "req-1", "data": map[string]any{"years": "5"},
+	}}); err != nil {
+		t.Fatal(err)
+	}
+}
+
+type ledgerHost struct {
+	extension.Host
+	kv map[string]string
+}
+
+func (h *ledgerHost) KVPut(key, value string) error               { h.kv[key] = value; return nil }
+func (h *ledgerHost) Audit(action, target, evidence string) error { return nil }

internal/server/platform_api.go

@@ -268,6 +268,34 @@ func (s *Server) setSurfaceActivation(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, row)
 }
 
+func (s *Server) submitSurfaceAction(w http.ResponseWriter, r *http.Request) {
+	if s.Surfaces == nil {
+		http.Error(w, "surface capability not enabled", http.StatusNotImplemented)
+		return
+	}
+	// 注意：本端点不绑定任何 confirmed 类字段——高危确认只能经既有确认卡回道
+	// （bus.Confirm）置位，客户端/模型无法伪造（U5 提案第二节第 2 条红测）。
+	var body struct {
+		ActionID  string         `json:"actionId"`
+		Revision  int            `json:"revision"`
+		RequestID string         `json:"requestId"`
+		Data      map[string]any `json:"data"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&body); err != nil || body.ActionID == "" || body.RequestID == "" {
+		http.Error(w, "actionId and requestId required", http.StatusBadRequest)
+		return
+	}
+	res, err := s.Surfaces.SubmitAction(r.Context(), s.owner(r), surfacesvc.SubmitActionRequest{
+		SurfaceID: core.ID(r.PathValue("id")), ActionID: body.ActionID,
+		Revision: body.Revision, RequestID: body.RequestID, Data: body.Data,
+	})
+	if err != nil {
+		s.writeSurfaceError(w, err)
+		return
+	}
+	writeJSON(w, http.StatusOK, res)
+}
+
 // writeSurfaceError 把服务层确定错误映射到状态码：禁用/epoch=409 语义（准入
 // 截止），规格违规=400 带字段清单，冲突=409 带当前版本，NotFound=404。
 func (s *Server) writeSurfaceError(w http.ResponseWriter, err error) {
@@ -277,6 +305,10 @@ func (s *Server) writeSurfaceError(w http.ResponseWriter, err error) {
 	case errors.Is(err, surfacesvc.ErrDisabled), errors.Is(err, surfacesvc.ErrStaleEpoch),
 		errors.Is(err, surfacesvc.ErrUnavailable):
 		http.Error(w, err.Error(), http.StatusForbidden)
+	case errors.Is(err, surfacesvc.ErrUnknownAction):
+		http.Error(w, err.Error(), http.StatusBadRequest)
+	case errors.Is(err, store.ErrIdempotencyConflict):
+		http.Error(w, err.Error(), http.StatusConflict)
 	case errors.As(err, &invalid):
 		writeJSON(w, http.StatusBadRequest, map[string]any{"error": "invalid spec", "details": invalid.Errs})
 	case errors.As(err, &conflict):

internal/server/server.go

@@ -315,6 +315,7 @@ func (s *Server) Handler() http.Handler {
 	mux.HandleFunc("POST /api/plugins/{id}/activation", s.setSurfaceActivation)
 	mux.HandleFunc("POST /api/surfaces", s.submitSurface)
 	mux.HandleFunc("GET /api/surfaces/{id}", s.getSurface)
+	mux.HandleFunc("POST /api/surfaces/{id}/actions", s.submitSurfaceAction)
 	mux.HandleFunc("GET /api/conversations/{id}/surfaces", s.listSurfaces)
 	mux.HandleFunc("POST /api/plugins/reload", s.reloadPlugins)
 	mux.HandleFunc("GET /api/plugins/settings-schema", s.pluginSettingsSchema)

internal/server/surface_api_test.go

@@ -6,6 +6,8 @@ package server
 
 import (
 	"bytes"
+	"context"
+	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -87,3 +89,61 @@ func TestSurfaceDirectAPIGuards(t *testing.T) {
 		}
 	}
 }
+
+// U5：动作端点红测——禁用 403、未知动作 400、端点不绑定 confirmed（伪造无入口）。
+func TestSurfaceActionEndpoint(t *testing.T) {
+	srv, st := newAuthTestServer(t)
+	h := srv.Handler()
+	key, _ := st.CreateAPIKey("alice", "e2e")
+	svc := surfacesvc.New(st, nil)
+	svc.SetDispatcher(func(ctx context.Context, d surfacesvc.ActionDispatch) (surfacesvc.ActionOutcome, error) {
+		return surfacesvc.ActionOutcome{State: "committed", Receipt: map[string]any{"ok": true}}, nil
+	})
+	srv.Surfaces = svc
+	ctx := context.Background()
+	svc.SetActivation(ctx, "alice", "generative-ui", true)
+	spec := `"spec":{"title":"表单页","nodes":[{"type":"actions","id":"a1","actions":[{"id":"generative-ui.submit","label":"提交"}]}]}`
+	post := func(body string) *httptest.ResponseRecorder {
+		req := httptest.NewRequest(http.MethodPost, "/api/surfaces", bytes.NewBufferString(`{"pluginId":"generative-ui","conversationId":"c1",`+spec+`}`))
+		req.Header.Set("Authorization", "Bearer "+key)
+		rec := httptest.NewRecorder()
+		h.ServeHTTP(rec, req)
+		return rec
+	}
+	rec := post("")
+	if rec.Code != http.StatusCreated {
+		t.Fatalf("setup submit failed: %d %s", rec.Code, rec.Body.String())
+	}
+	var snap struct {
+		Identity struct {
+			SurfaceID string `json:"surfaceId"`
+		} `json:"identity"`
+		Revision int `json:"revision"`
+	}
+	readJSON(t, rec.Body.Bytes(), &snap)
+
+	act := func(body string) *httptest.ResponseRecorder {
+		req := httptest.NewRequest(http.MethodPost, "/api/surfaces/"+snap.Identity.SurfaceID+"/actions", bytes.NewBufferString(body))
+		req.Header.Set("Authorization", "Bearer "+key)
+		req.Header.Set("Content-Type", "application/json")
+		rec := httptest.NewRecorder()
+		h.ServeHTTP(rec, req)
+		return rec
+	}
+	// 未知动作 → 400
+	if r := act(`{"actionId":"shell.exec","revision":` + fmt.Sprint(snap.Revision) + `,"requestId":"r1","data":{}}`); r.Code != http.StatusBadRequest {
+		t.Fatalf("unknown action should 400, got %d: %s", r.Code, r.Body.String())
+	}
+	// 伪造 confirmed 字段：请求体里带 confirmed:true 不产生任何效果（端点不绑定
+	// 该字段；DangerHigh 确认只能经确认卡回道）。此处 submit 非 DangerHigh，
+	// 断言 confirmed 被忽略（成功且不因它改变行为）。
+	if r := act(`{"actionId":"generative-ui.submit","revision":` + fmt.Sprint(snap.Revision) + `,"requestId":"r2","data":{"a":"1"},"confirmed":true}`); r.Code != http.StatusOK {
+		t.Fatalf("submit with forged confirmed should still be normal submit, got %d: %s", r.Code, r.Body.String())
+	}
+	// 禁用后 → 403
+	svc.SetActivation(ctx, "alice", "generative-ui", false)
+	if r := act(`{"actionId":"generative-ui.submit","revision":` + fmt.Sprint(snap.Revision) + `,"requestId":"r3","data":{}}`); r.Code != http.StatusForbidden {
+		t.Fatalf("post-disable action should 403, got %d", r.Code)
+	}
+	_ = fmt.Sprint
+}

internal/store/migrate.go

@@ -649,6 +649,45 @@ func init() {
 				`DROP TABLE IF EXISTS run_commands`,
 				`DROP TABLE IF EXISTS conversation_executions`,
 			}}},
+		migration{version: 24, name: "surface_actions",
+			// Generative UI U5（提案 U5 动作范围 r2）：动作提交幂等台账——
+			// (owner, surface, action, requestId) 唯一；同 requestId 同参数重放返回
+			// 已有回执，异参数拒绝；awaiting_confirm 记确认卡关联（执行权威在命令
+			// 总线审计台账）。
+			up: map[string][]string{"sqlite": {
+				`CREATE TABLE IF NOT EXISTS surface_actions (
+				owner TEXT NOT NULL,
+				surface_id TEXT NOT NULL,
+				action_id TEXT NOT NULL,
+				request_id TEXT NOT NULL,
+				revision INTEGER NOT NULL,
+				params_hash TEXT NOT NULL,
+				state TEXT NOT NULL,
+				receipt TEXT NOT NULL DEFAULT '',
+				card_id TEXT NOT NULL DEFAULT '',
+				created_at TEXT NOT NULL,
+				PRIMARY KEY (owner, surface_id, action_id, request_id)
+			)`,
+			}, "postgres": {
+				`CREATE TABLE IF NOT EXISTS surface_actions (
+				owner TEXT NOT NULL,
+				surface_id TEXT NOT NULL,
+				action_id TEXT NOT NULL,
+				request_id TEXT NOT NULL,
+				revision INTEGER NOT NULL,
+				params_hash TEXT NOT NULL,
+				state TEXT NOT NULL,
+				receipt TEXT NOT NULL DEFAULT '',
+				card_id TEXT NOT NULL DEFAULT '',
+				created_at TEXT NOT NULL,
+				PRIMARY KEY (owner, surface_id, action_id, request_id)
+			)`,
+			}},
+			down: map[string][]string{"sqlite": {
+				`DROP TABLE IF EXISTS surface_actions`,
+			}, "postgres": {
+				`DROP TABLE IF EXISTS surface_actions`,
+			}}},
 	)
 }
 

internal/store/surface_actions.go

@@ -0,0 +1,76 @@
+package store
+
+import (
+	"database/sql"
+	"errors"
+	"time"
+)
+
+// ---- Generative UI Surface 动作台账（提案 U5；迁移 v23）----
+
+// SurfaceActionRecord 是一次动作提交的台账行。state: submitted（已分发）/
+// awaiting_confirm（高危确认卡挂起，执行权威在命令总线审计）/ committed /
+// rejected（分发被拒）。同 requestId 重放读此行返回原回执。
+type SurfaceActionRecord struct {
+	Owner      string
+	SurfaceID  string
+	ActionID   string
+	RequestID  string
+	Revision   int
+	ParamsHash string
+	State      string
+	Receipt    string
+	CardID     string
+	CreatedAt  string
+}
+
+// ErrIdempotencyConflict 同 requestId 但参数不同：拒绝（KTD6）。
+var ErrIdempotencyConflict = errors.New("surface action: request id reused with different params")
+
+// SaveSurfaceActionIfAbsent 幂等写入：首个提交插入成功（first=true）；
+// 已存在时返回既有行（first=false）。参数一致性由调用方比对 ParamsHash。
+func (s *Store) SaveSurfaceActionIfAbsent(rec SurfaceActionRecord) (SurfaceActionRecord, bool, error) {
+	rec.CreatedAt = time.Now().UTC().Format(time.RFC3339)
+	res, err := s.db.Exec(s.q(`INSERT INTO surface_actions(owner,surface_id,action_id,request_id,revision,params_hash,state,receipt,card_id,created_at)
+		VALUES(?,?,?,?,?,?,?,?,?,?)
+		ON CONFLICT(owner, surface_id, action_id, request_id) DO NOTHING`),
+		rec.Owner, rec.SurfaceID, rec.ActionID, rec.RequestID, rec.Revision,
+		rec.ParamsHash, rec.State, rec.Receipt, rec.CardID, rec.CreatedAt)
+	if err != nil {
+		return rec, false, err
+	}
+	n, _ := res.RowsAffected()
+	existing, err := s.GetSurfaceAction(rec.Owner, rec.SurfaceID, rec.ActionID, rec.RequestID)
+	if err != nil {
+		return rec, false, err
+	}
+	return existing, n == 1, nil // RowsAffected=1 → 本调用完成首插（时间戳同秒不可靠）
+}
+
+// GetSurfaceAction 读取台账行（不存在 → ErrNotFound）。
+func (s *Store) GetSurfaceAction(owner, surfaceID, actionID, requestID string) (SurfaceActionRecord, error) {
+	var r SurfaceActionRecord
+	err := s.db.QueryRow(s.q(`SELECT owner,surface_id,action_id,request_id,revision,params_hash,state,receipt,card_id,created_at
+		FROM surface_actions WHERE owner=? AND surface_id=? AND action_id=? AND request_id=?`),
+		owner, surfaceID, actionID, requestID).
+		Scan(&r.Owner, &r.SurfaceID, &r.ActionID, &r.RequestID, &r.Revision, &r.ParamsHash, &r.State, &r.Receipt, &r.CardID, &r.CreatedAt)
+	if errors.Is(err, sql.ErrNoRows) {
+		return r, ErrNotFound
+	}
+	return r, err
+}
+
+// UpdateSurfaceActionState 回写分发结果（首个提交提交后的状态迁移）。
+func (s *Store) UpdateSurfaceActionState(owner, surfaceID, actionID, requestID, state, receipt, cardID string) error {
+	res, err := s.db.Exec(s.q(`UPDATE surface_actions SET state=?, receipt=?, card_id=?
+		WHERE owner=? AND surface_id=? AND action_id=? AND request_id=?`),
+		state, receipt, cardID, owner, surfaceID, actionID, requestID)
+	if err != nil {
+		return err
+	}
+	n, _ := res.RowsAffected()
+	if n == 0 {
+		return ErrNotFound
+	}
+	return nil
+}

internal/surfacesvc/actions_test.go

@@ -0,0 +1,154 @@
+package surfacesvc
+
+// U5 红测（已批准范围 r2 验收线）：启停守卫、旧修订拒绝、白名单拒绝、
+// 幂等同参回放/异参拒绝、DangerHigh 经确认卡且执行只由卡回道触发。
+// 数据准备走真实 surfacesvc.Submit（与生产同路径）。
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"path/filepath"
+	"testing"
+
+	"agent-system-backend/internal/store"
+	core "agent-system-core"
+)
+
+type actionFixture struct {
+	svc     *Service
+	st      *store.Store
+	surface core.SurfaceIdentity
+	rev     int
+}
+
+func newActionFixture(t *testing.T) *actionFixture {
+	t.Helper()
+	st, err := store.OpenSQLite(filepath.Join(t.TempDir(), "test.db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { st.Close() })
+	svc := New(st, nil)
+	ctx := context.Background()
+	if _, err := svc.SetActivation(ctx, "alice", "generative-ui", true); err != nil {
+		t.Fatal(err)
+	}
+	snap, err := svc.Submit(ctx, "alice", "generative-ui", SubmitRequest{
+		ConversationID: "c1",
+		Spec:           json.RawMessage(`{"title":"需求表","nodes":[{"type":"form","id":"f1","fields":[{"key":"years","label":"年限","type":"select","options":["3","5"]}]},{"type":"actions","id":"a1","actions":[{"id":"generative-ui.submit","label":"提交"}]}]}`),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	return &actionFixture{svc: svc, st: st, surface: snap.Identity, rev: snap.Revision}
+}
+
+func TestSubmitActionGuards(t *testing.T) {
+	f := newActionFixture(t)
+	ctx := context.Background()
+	// 白名单外动作 → 拒绝
+	if _, err := f.svc.SubmitAction(ctx, "alice", SubmitActionRequest{SurfaceID: f.surface.SurfaceID,
+		ActionID: "shell.exec", Revision: f.rev, RequestID: "r0", Data: map[string]any{}}); !errors.Is(err, ErrUnknownAction) {
+		t.Fatalf("unknown action should reject, got %v", err)
+	}
+	// 旧修订 → 冲突（带当前版本）
+	_, err := f.svc.SubmitAction(ctx, "alice", SubmitActionRequest{SurfaceID: f.surface.SurfaceID,
+		ActionID: "generative-ui.submit", Revision: f.rev - 1, RequestID: "r0b", Data: map[string]any{}})
+	var conflict *store.ErrRevisionConflict
+	if !errors.As(err, &conflict) || conflict.Current != f.rev {
+		t.Fatalf("stale revision should conflict with current=%d, got %v", f.rev, err)
+	}
+	// 跨 owner → NotFound
+	if _, err := f.svc.SubmitAction(ctx, "bob", SubmitActionRequest{SurfaceID: f.surface.SurfaceID,
+		ActionID: "generative-ui.submit", Revision: f.rev, RequestID: "r0c", Data: map[string]any{}}); !errors.Is(err, ErrNotFound) {
+		t.Fatalf("cross-owner should be NotFound, got %v", err)
+	}
+	// 未装配 dispatcher → 能力不可用
+	if _, err := f.svc.SubmitAction(ctx, "alice", SubmitActionRequest{SurfaceID: f.surface.SurfaceID,
+		ActionID: "generative-ui.submit", Revision: f.rev, RequestID: "r0d", Data: map[string]any{}}); !errors.Is(err, ErrUnavailable) {
+		t.Fatalf("no dispatcher should be unavailable, got %v", err)
+	}
+}
+
+func TestSubmitActionIdempotency(t *testing.T) {
+	f := newActionFixture(t)
+	ctx := context.Background()
+	var calls int
+	f.svc.SetDispatcher(func(ctx context.Context, d ActionDispatch) (ActionOutcome, error) {
+		calls++
+		return ActionOutcome{State: "committed", Receipt: map[string]any{"op": "op_1"}}, nil
+	})
+	data := map[string]any{"years": "5"}
+	r1, err := f.svc.SubmitAction(ctx, "alice", SubmitActionRequest{SurfaceID: f.surface.SurfaceID,
+		ActionID: "generative-ui.submit", Revision: f.rev, RequestID: "req-1", Data: data})
+	if err != nil || r1.State != "committed" {
+		t.Fatalf("first submit: %+v err=%v", r1, err)
+	}
+	// 同 requestId 同参数 → 回放已有回执，不再分发
+	r2, err := f.svc.SubmitAction(ctx, "alice", SubmitActionRequest{SurfaceID: f.surface.SurfaceID,
+		ActionID: "generative-ui.submit", Revision: f.rev, RequestID: "req-1", Data: data})
+	if err != nil || r2.State != "committed" || calls != 1 {
+		t.Fatalf("idempotent replay must not redispatch: calls=%d r2=%+v err=%v", calls, r2, err)
+	}
+	// 同 requestId 异参数 → 拒绝
+	if _, err := f.svc.SubmitAction(ctx, "alice", SubmitActionRequest{SurfaceID: f.surface.SurfaceID,
+		ActionID: "generative-ui.submit", Revision: f.rev, RequestID: "req-1",
+		Data: map[string]any{"years": "3"}}); !errors.Is(err, store.ErrIdempotencyConflict) {
+		t.Fatalf("same requestId different params must reject, got %v", err)
+	}
+}
+
+func TestSubmitActionDisabledAfterEnable(t *testing.T) {
+	f := newActionFixture(t)
+	ctx := context.Background()
+	f.svc.SetDispatcher(func(ctx context.Context, d ActionDispatch) (ActionOutcome, error) {
+		return ActionOutcome{State: "committed"}, nil
+	})
+	// 禁用后：新动作拒绝（KTD7：禁用返回即准入截止点）
+	if _, err := f.svc.SetActivation(ctx, "alice", "generative-ui", false); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := f.svc.SubmitAction(ctx, "alice", SubmitActionRequest{SurfaceID: f.surface.SurfaceID,
+		ActionID: "generative-ui.submit", Revision: f.rev, RequestID: "r9", Data: map[string]any{}}); !errors.Is(err, ErrDisabled) {
+		t.Fatalf("post-disable action should reject, got %v", err)
+	}
+}
+
+func TestDangerHighGoesThroughConfirmCard(t *testing.T) {
+	f := newActionFixture(t)
+	ctx := context.Background()
+	// 模拟把一条 DangerHigh 命令加入白名单（B 类机制验证；正式白名单由独立评审加）。
+	prev := AllowedActions["generative-ui.submit"]
+	saved := map[string]string{"generative-ui.submit": "generative-ui.submit"}
+	_ = prev
+	AllowedActions["test.highwrite"] = "test.highwrite"
+	defer func() {
+		delete(AllowedActions, "test.highwrite")
+		_ = saved
+	}()
+	var executed int
+	f.svc.SetDispatcher(func(ctx context.Context, d ActionDispatch) (ActionOutcome, error) {
+		// 模拟总线行为：DangerHigh 未确认 → 创建确认卡、不执行（真实路径在
+		// cmdbus 红测；此处验证 surfacesvc 不透传 Confirmed 的等价语义）。
+		if d.Params["confirmed"] == true {
+			executed++
+			return ActionOutcome{State: "committed"}, nil
+		}
+		return ActionOutcome{State: "awaiting_confirm", CardID: "card_1"}, nil
+	})
+	res, err := f.svc.SubmitAction(ctx, "alice", SubmitActionRequest{SurfaceID: f.surface.SurfaceID,
+		ActionID: "test.highwrite", Revision: f.rev, RequestID: "req-h", Data: map[string]any{"x": 1}})
+	if err != nil || res.State != "awaiting_confirm" || res.CardID == "" {
+		t.Fatalf("danger-high must await confirm card: %+v err=%v", res, err)
+	}
+	if executed != 0 {
+		t.Fatal("danger-high must not execute without card confirm")
+	}
+	// 重放同 requestId： awaiting_confirm 态原样返回（未执行的确认仍挂在卡上）
+	res2, err := f.svc.SubmitAction(ctx, "alice", SubmitActionRequest{SurfaceID: f.surface.SurfaceID,
+		ActionID: "test.highwrite", Revision: f.rev, RequestID: "req-h", Data: map[string]any{"x": 1}})
+	if err != nil || res2.State != "awaiting_confirm" {
+		t.Fatalf("replay should return awaiting_confirm, got %+v err=%v", res2, err)
+	}
+}

internal/surfacesvc/surfacesvc.go

@@ -7,6 +7,7 @@ package surfacesvc
 import (
 	"bytes"
 	"context"
+	"crypto/sha256"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -45,10 +46,11 @@ type SubmitRequest struct {
 }
 
 type Service struct {
-	st    *store.Store
-	emit  Emitter
-	now   func() (t string)
-	logln func(format string, v ...any)
+	st       *store.Store
+	emit     Emitter
+	dispatch Dispatcher
+	now      func() (t string)
+	logln    func(format string, v ...any)
 }
 
 func New(st *store.Store, emit Emitter) *Service {
@@ -200,3 +202,136 @@ func decodeSpecStrict(raw json.RawMessage) (core.SurfaceSpec, error) {
 	}
 	return spec, nil
 }
+
+// ---- 动作提交（U5；已批准范围 r2：A 客户端本地不经此层；B/C 经此单一咽喉）----
+
+// ErrUnknownAction 引用了未开放的动作 id（白名单外；KTD6 未知动作一律拒绝）。
+var ErrUnknownAction = errors.New("surface action: unknown or not allowed action id")
+
+// ActionDispatch 由组合根注入：把动作转交命令总线（四入口同源：审计信封、
+// 参数校验、DangerHigh 内联确认卡、幂等 pendingStore——全部复用，不新造）。
+type ActionDispatch struct {
+	CommandID      string
+	Owner          string
+	ConversationID string
+	Params         map[string]any
+}
+
+// ActionOutcome 是一次分发的结果（组合根从 cmdbus.Response 折叠）。
+type ActionOutcome struct {
+	State   string // awaiting_confirm | committed | rejected
+	CardID  string
+	Receipt any
+	Payload any
+}
+
+type Dispatcher func(ctx context.Context, d ActionDispatch) (ActionOutcome, error)
+
+// AllowedActions 是动作 id → 命令 id 的白名单（U5 第一版仅插件自有提交；
+// B 类命令逐条经独立评审后加入）。
+var AllowedActions = map[string]string{
+	"generative-ui.submit": "generative-ui.submit",
+}
+
+// SubmitActionRequest 是一次页面动作提交（按钮点击）。
+type SubmitActionRequest struct {
+	SurfaceID core.ID
+	ActionID  string
+	Revision  int
+	RequestID string
+	Data      map[string]any
+}
+
+// SurfaceActionResult 是动作提交结果（含确认卡关联或命令回执）。
+type SurfaceActionResult struct {
+	SurfaceID string `json:"surfaceId"`
+	ActionID  string `json:"actionId"`
+	RequestID string `json:"requestId"`
+	State     string `json:"state"`
+	CardID    string `json:"cardId,omitempty"`
+	Receipt   any    `json:"receipt,omitempty"`
+	Payload   any    `json:"payload,omitempty"`
+	Note      string `json:"note,omitempty"`
+}
+
+func (s *Service) SetDispatcher(d Dispatcher) { s.dispatch = d }
+
+// SubmitAction：启停 → revision 现势 → 白名单 → 幂等台账 → 命令总线分发。
+// 本方法不接收也不透传 Confirmed：高危确认只能经既有确认卡回道置位，
+// 模型或客户端伪造 Confirmed 无入口（红测断言）。
+func (s *Service) SubmitAction(ctx context.Context, owner string, req SubmitActionRequest) (SurfaceActionResult, error) {
+	cmd, ok := AllowedActions[req.ActionID]
+	if !ok {
+		return SurfaceActionResult{}, ErrUnknownAction
+	}
+	if req.RequestID == "" {
+		return SurfaceActionResult{}, &ErrInvalidSpec{Errs: []string{"requestId required"}}
+	}
+	rec, err := s.st.GetSurface(owner, string(req.SurfaceID))
+	if err != nil {
+		return SurfaceActionResult{}, err
+	}
+	if act, err := s.st.GetActivation(owner, rec.PluginID); err != nil {
+		return SurfaceActionResult{}, err
+	} else if !act.Enabled {
+		return SurfaceActionResult{}, ErrDisabled
+	}
+	if req.Revision != rec.LatestRevision {
+		return SurfaceActionResult{}, &store.ErrRevisionConflict{Current: rec.LatestRevision}
+	}
+	if s.dispatch == nil {
+		return SurfaceActionResult{}, ErrUnavailable
+	}
+	raw, _ := json.Marshal(req.Data)
+	hash := fmt.Sprintf("%x", sha256.Sum256(raw))
+	existing, first, err := s.st.SaveSurfaceActionIfAbsent(store.SurfaceActionRecord{
+		Owner: owner, SurfaceID: string(req.SurfaceID), ActionID: req.ActionID,
+		RequestID: req.RequestID, Revision: req.Revision, ParamsHash: hash, State: "submitted",
+	})
+	if err != nil {
+		return SurfaceActionResult{}, err
+	}
+	if !first {
+		if existing.ParamsHash != hash {
+			return SurfaceActionResult{}, store.ErrIdempotencyConflict
+		}
+		return SurfaceActionResult{
+			SurfaceID: existing.SurfaceID, ActionID: existing.ActionID, RequestID: existing.RequestID,
+			State: existing.State, CardID: existing.CardID,
+			Receipt: json.RawMessage(orEmptyJSON(existing.Receipt)),
+			Note:    "幂等重放：返回已有回执",
+		}, nil
+	}
+	out, err := s.dispatch(ctx, ActionDispatch{
+		CommandID: cmd, Owner: owner, ConversationID: rec.ConversationID,
+		Params: map[string]any{"surfaceId": string(req.SurfaceID), "revision": req.Revision,
+			"requestId": req.RequestID, "data": req.Data},
+	})
+	state, cardID := out.State, out.CardID
+	if err != nil {
+		state, cardID = "rejected", ""
+	}
+	receiptJSON, _ := json.Marshal(out.Receipt)
+	if uerr := s.st.UpdateSurfaceActionState(owner, string(req.SurfaceID), req.ActionID, req.RequestID,
+		state, string(receiptJSON), cardID); uerr != nil {
+		s.logln("surface: action state update failed: %v", uerr)
+	}
+	if err != nil {
+		return SurfaceActionResult{}, err
+	}
+	note := ""
+	if state == "awaiting_confirm" {
+		note = "高危动作已发确认卡，请确认后执行"
+	}
+	return SurfaceActionResult{
+		SurfaceID: string(req.SurfaceID), ActionID: req.ActionID, RequestID: req.RequestID,
+		State: state, CardID: cardID, Receipt: out.Receipt, Payload: out.Payload, Note: note,
+	}, nil
+}
+
+func orEmptyJSON(s string) string {
+	if s == "" {
+		return "null"
+	}
+	return s
+}