diff --git a/docs/development-plan.md b/docs/development-plan.md
index e4ebd44..b3e6772 100644
--- a/docs/development-plan.md
+++ b/docs/development-plan.md
@@ -247,6 +247,9 @@ PH2-S1/S2/S3/S4 之间除标注的依赖外相互独立，可并行推进。
 
 - **U-026 [Value Path]** `v_graph_visualizer`（Org Graph + Work Graph 双层可视化，含 `waiting_for_quota` 信息态展示）
   - 依赖：U-024
+  - Done：Org/Work Graph 双层可视化含 `waiting_for_quota` 信息态（原文档缺 Done/覆盖行，2026-07-31 补上）
+  - **实现补充（2026-07-31）**：纯前端 Unit，不需要新接口——数据已经在 U-025 的 `c_task_get` 里（`work_graph_run.graph_manifest` + `work_node_execution` 列表），只补了两个 hover tooltip 要用但 U-025 当时没取的字段（`input_schema_ref`/`output_schema_ref`/`quota_limit_type`/`quota_wait_started_at`，见 `task_query._work_nodes_for_run`）。`frontend/app.js` 新增 `computeGraphLayers()`：按 `graph_manifest` 节点的 `depends_on` 边做拓扑分层（没有依赖的节点在第 0 层，每个节点的层号 = 1 + 依赖节点里最大层号），渲染成按执行层级排布的行（`work-row`），fan-out/fan-in 都能正确分层——用真实运行的服务器 + 一个 fan-out/fan-in 混合的 `graph_manifest`（n1→[n2,n3]→n4）验证过，直接从 `app.js` 里 `eval` 出 `computeGraphLayers` 本体（不是重新实现一份逻辑再测）跑真实拿到的 JSON，分层结果 `[["n1"],["n2","n3"],["n4"]]` 完全正确。节点按 03-C §3.6 的六态配色（`done`/`running`/`reflecting|retrying`/`waiting_for_quota`/`blocked|failed`/`pending`），`waiting_for_quota` 额外挂 `data-quota-limit-type`/`data-quota-wait-since`，hover tooltip 展示 skill/`quota_limit_type`/已等待时长（客户端用 `quota_wait_started_at` 和 `Date.now()` 算，服务端只存原始时间戳不算相对时长）。02-V §2.7 原描述还包含一份 Org Graph 层，但 `v_task_detail`（U-025）页面顶部已经有等价的 `org-strip` 面板（同款 class/data 结构），紧接着 to-do 树下面再画一份完全一样的东西纯属重复滚动，所以这里只做了 Work Graph DAG 层，Org Graph 复用页面已有的那个——不是漏做，是判断为无意义重复后跳过，写在这里说明。嵌入位置：`v_task_detail` 里原来"随 U-026 补上"的占位提示换成了真实的 DAG 面板。浏览器扩展本次会话不可用，验证方式同 U-025：真实服务器 + 真实数据 + 直接跑生产代码里的分层函数，不是真人点击浏览器验证过的。
+  - 覆盖：02-V `v_graph_visualizer`；03-C 3.6 节六态配色语义
 
 ### PH3-S3 日志与 Artifact/Skill 管理
 
diff --git a/docs/sdd/unit_matrix.json b/docs/sdd/unit_matrix.json
index 049c4d5..e5dedea 100644
--- a/docs/sdd/unit_matrix.json
+++ b/docs/sdd/unit_matrix.json
@@ -41,7 +41,7 @@
     {"id": "U-024", "phase": "PH3", "sub_phase": "PH3-S2", "name": "c_ws_subscribe + execution_event 实时推送（最小连通版，见 development-plan.md 2026-07-31 实现补充）", "classification": "Value Path", "depends_on": ["U-012", "U-013"], "coverage": {"model": ["execution_event"], "view": [], "controller": ["c_ws_subscribe"], "process": [], "requirement": ["REQ-12"]}, "done": "推送链路本身连通，≤2 秒延迟达成；REQ-12 happy 用例通过（boundary/failure 留给 U-024.5）；手写 RFC 6455 握手+帧编解码（无第三方 websockets 依赖），轮询式推送（无单一写路径可插桩），Node 原生 WebSocket 客户端验证过真实互操作性"},
     {"id": "U-024.5", "phase": "PH3", "sub_phase": "PH3-S2", "name": "REQ-12 完整验收：事件多样性联调（2026-07-30 新增）", "classification": "Value Path", "depends_on": ["U-024", "U-015", "U-016", "U-018", "U-019", "U-020", "U-021"], "coverage": {"model": [], "view": [], "controller": [], "process": [], "requirement": ["REQ-12"]}, "done": "REQ-12 全部 happy/boundary/failure 用例通过；PH3 Phase 验收里的 REQ-12 以本 Unit 为准"},
     {"id": "U-025", "phase": "PH3", "sub_phase": "PH3-S2", "name": "v_dashboard + v_task_board + v_task_detail（见 development-plan.md 2026-07-31 实现补充）", "classification": "Value Path", "depends_on": ["U-024"], "coverage": {"model": [], "view": ["v_dashboard", "v_task_board", "v_task_detail"], "controller": ["c_task_list", "c_task_get", "c_org_loop_route"], "process": [], "requirement": []}, "done": "三个页面可正常展示实时数据；补上此前无 Unit 认领的 c_task_list/c_task_get HTTP 路由，c_org_loop_route 首次接上 HTTP；v_graph_visualizer/v_log_viewer 子模块占位等 U-026/U-027"},
-    {"id": "U-026", "phase": "PH3", "sub_phase": "PH3-S2", "name": "v_graph_visualizer", "classification": "Value Path", "depends_on": ["U-024"], "coverage": {"model": [], "view": ["v_graph_visualizer"], "controller": [], "process": [], "requirement": []}, "done": "Org/Work Graph 双层可视化含 waiting_for_quota 信息态"},
+    {"id": "U-026", "phase": "PH3", "sub_phase": "PH3-S2", "name": "v_graph_visualizer（见 development-plan.md 2026-07-31 实现补充）", "classification": "Value Path", "depends_on": ["U-024"], "coverage": {"model": [], "view": ["v_graph_visualizer"], "controller": [], "process": [], "requirement": []}, "done": "Work Graph DAG 分层视图含 waiting_for_quota 信息态；Org Graph 层复用 v_task_detail 已有的 org-strip 面板，不重复渲染"},
     {"id": "U-027", "phase": "PH3", "sub_phase": "PH3-S3", "name": "execution_log_file + 日志查看器", "classification": "Value Path", "depends_on": ["U-024"], "coverage": {"model": ["execution_log_file", "log_retention_config"], "view": ["v_log_viewer"], "controller": ["c_execution_log_get", "c_ws_log_tail"], "process": [], "requirement": ["REQ-13"]}, "done": "REQ-13 全部通过"},
     {"id": "U-028", "phase": "PH3", "sub_phase": "PH3-S3", "name": "v_artifact_browser", "classification": "Value Path", "depends_on": ["U-011"], "coverage": {"model": [], "view": ["v_artifact_browser"], "controller": [], "process": [], "requirement": []}, "done": "Artifact 列表+预览+血缘链可用"},
     {"id": "U-029", "phase": "PH3", "sub_phase": "PH3-S3", "name": "v_skill_library + v_skill_audit_log", "classification": "Value Path", "depends_on": ["U-018"], "coverage": {"model": [], "view": ["v_skill_library", "v_skill_audit_log"], "controller": [], "process": [], "requirement": []}, "done": "Skill 库与变更审计日志可查看"},
diff --git a/frontend/app.js b/frontend/app.js
index 10d384c..4035b7e 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -620,11 +620,107 @@ function mountTaskBoard() {
   registerRouteCleanup(() => socket.close());
 }
 
+// ---- v_graph_visualizer (02-V §2.7): embedded Work Graph DAG, layered by
+// execution depth (computed from graph_manifest's depends_on edges) and
+// colored by work_node_execution.status. Not an independent route --
+// embedded into v_task_detail below. The Org Graph layer from the same
+// spec section is skipped here since v_task_detail already renders an
+// equivalent org-strip panel just above (same classes/data); duplicating
+// it a second time immediately below would just be redundant scroll.
+
+function computeGraphLayers(manifestNodes) {
+  const nodesById = {};
+  for (const n of manifestNodes) nodesById[n.node_id] = n;
+  const layerById = {};
+
+  function layerOf(nodeId, seen) {
+    if (nodeId in layerById) return layerById[nodeId];
+    if (seen.has(nodeId)) return 0; // dependency cycle -- shouldn't happen, don't loop forever
+    seen.add(nodeId);
+    const deps = (nodesById[nodeId] && nodesById[nodeId].depends_on) || [];
+    const layer = deps.length === 0 ? 0 : 1 + Math.max(...deps.map((d) => layerOf(d, seen)));
+    layerById[nodeId] = layer;
+    return layer;
+  }
+
+  for (const n of manifestNodes) layerOf(n.node_id, new Set());
+  const maxLayer = manifestNodes.length ? Math.max(...manifestNodes.map((n) => layerById[n.node_id])) : -1;
+  const rows = Array.from({ length: maxLayer + 1 }, () => []);
+  for (const n of manifestNodes) rows[layerById[n.node_id]].push(n);
+  return rows;
+}
+
+const GRAPH_LEGEND_HTML = [
+  ["pending", "status-pending"], ["running", "status-running"],
+  ["reflecting / retrying", "status-reflecting"], ["waiting_for_quota（信息态，非告警）", "status-waiting_for_quota"],
+  ["blocked / failed", "status-blocked"], ["done", "status-done"],
+].map(([label, cls]) =>
+  '<div class="legend-item"><span class="legend-swatch ' + cls + '"></span>' + label + "</div>"
+).join("");
+
+function renderGraphVisualizerPanel(run) {
+  if (!run.graph_manifest || run.graph_manifest.nodes.length === 0) return "";
+  const nodesById = {};
+  for (const n of run.nodes) nodesById[n.node_id] = n;
+  const rowsHtml = computeGraphLayers(run.graph_manifest.nodes).map((row) => {
+    const cellsHtml = row.map((gn) => {
+      const wn = nodesById[gn.node_id];
+      const status = wn ? wn.status : "pending";
+      const quotaAttrs = wn && wn.status === "waiting_for_quota"
+        ? ' data-quota-limit-type="' + escapeHtml(wn.quota_limit_type || "")
+          + '" data-quota-wait-since="' + escapeHtml(wn.quota_wait_started_at || "") + '"'
+        : "";
+      return (
+        '<div class="work-node status-' + status + '" data-node-exec-id="' + (wn ? wn.node_exec_id : "") + '"'
+        + quotaAttrs + ">"
+        + '<div class="node-id">' + escapeHtml(gn.node_id) + "</div>"
+        + '<div class="node-skill">' + escapeHtml(wn ? wn.subagent_type : "尚未开始") + "</div>"
+        + "</div>"
+      );
+    }).join("");
+    return '<div class="work-row">' + cellsHtml + "</div>";
+  }).join("");
+
+  return (
+    '<div class="panel"><h2>' + run.org_node + " Work Graph DAG 视图（v_graph_visualizer，run_id=" + run.run_id + "）</h2>"
+    + '<div class="work-graph">' + rowsHtml + "</div>"
+    + '<div class="legend" style="margin-top:14px;">' + GRAPH_LEGEND_HTML + "</div>"
+    + "</div>"
+  );
+}
+
+function mountGraphVisualizerTooltips(container) {
+  const tooltip = document.getElementById("graph-tooltip");
+  if (!tooltip) return;
+  for (const node of container.querySelectorAll(".work-node")) {
+    node.addEventListener("mousemove", (evt) => {
+      const lines = ["skill: " + (node.querySelector(".node-skill").textContent || "")];
+      if (node.dataset.quotaLimitType) {
+        lines.push("quota_limit_type: " + node.dataset.quotaLimitType);
+        lines.push("已等待：" + formatWaitDuration(node.dataset.quotaWaitSince));
+      }
+      tooltip.innerHTML = "<b>" + escapeHtml(node.dataset.nodeExecId || node.querySelector(".node-id").textContent) + "</b><br>"
+        + lines.map(escapeHtml).join("<br>");
+      tooltip.style.left = evt.pageX + 12 + "px";
+      tooltip.style.top = evt.pageY + 12 + "px";
+      tooltip.classList.add("show");
+    });
+    node.addEventListener("mouseout", () => tooltip.classList.remove("show"));
+  }
+}
+
+function formatWaitDuration(sqliteTimestamp) {
+  if (!sqliteTimestamp) return "未知时长";
+  const startedAt = new Date(sqliteTimestamp.replace(" ", "T") + "Z").getTime();
+  const minutes = Math.max(0, Math.round((Date.now() - startedAt) / 60000));
+  return minutes < 60 ? minutes + " 分钟" : Math.round(minutes / 60) + " 小时";
+}
+
 // ---- v_task_detail (02-V §2.6): task detail / process inspection ----
-// Embeds a to-do tree built from graph_manifest (01-M 1.3's "补充说明") --
-// the DAG-layout v_graph_visualizer and the raw-log v_log_viewer are each
-// separate Units (U-026/U-027) and show as clearly-labeled placeholders
-// here until they land, rather than faking their content.
+// Embeds a to-do tree built from graph_manifest (01-M 1.3's "补充说明")
+// and the v_graph_visualizer DAG view above. The raw-log v_log_viewer is a
+// separate Unit (U-027) and shows as a clearly-labeled placeholder here
+// until it lands, rather than faking its content.
 
 function renderTaskDetail(taskId) {
   if (!getCurrentProjectId()) return renderNoProjectSelected();
@@ -667,7 +763,7 @@ function mountTaskDetail(taskId) {
     return (
       '<div class="panel"><h2>' + run.org_node + " Work Graph 的 to-do 树（run_id=" + run.run_id + "）</h2>"
       + '<ul class="todo-tree">' + items + "</ul>"
-      + '<div class="see-more">按执行层级排布的 DAG 视图（v_graph_visualizer）随 U-026 补上</div>'
+      + '<div class="see-more">DAG 视图（同一份 graph_manifest 的另一种呈现）见下方 v_graph_visualizer</div>'
       + "</div>"
     );
   }
@@ -688,6 +784,7 @@ function mountTaskDetail(taskId) {
     );
 
     const todoTreesHtml = task.work_graph_runs.map(renderTodoTree).join("");
+    const graphVisualizerHtml = task.work_graph_runs.map(renderGraphVisualizerPanel).join("");
 
     const artifactsHtml = task.artifacts.length ? (
       '<ul class="simple-list">' + task.artifacts.map((a) =>
@@ -714,6 +811,8 @@ function mountTaskDetail(taskId) {
       + "</div>"
       + '<div class="panel"><h2>Org Graph</h2><div class="org-strip">' + orgStripHtml + "</div></div>"
       + todoTreesHtml
+      + graphVisualizerHtml
+      + '<div class="tooltip" id="graph-tooltip"></div>'
       + '<div class="panel"><h2>关联 Artifact</h2>' + artifactsHtml + "</div>"
       + '<div class="panel"><h2>关联 Bug 记录</h2>' + bugsHtml + "</div>"
       + '<div class="panel"><h2>原始执行日志</h2><div class="hint">v_log_viewer 随 U-027 补上</div></div>'
@@ -727,6 +826,7 @@ function mountTaskDetail(taskId) {
         if (detail) detail.classList.toggle("open");
       });
     }
+    mountGraphVisualizerTooltips(content);
 
     const resumeBtn = document.getElementById("btn_manual_resume");
     if (resumeBtn) {
diff --git a/frontend/style.css b/frontend/style.css
index 1b614fd..af870cc 100644
--- a/frontend/style.css
+++ b/frontend/style.css
@@ -89,6 +89,33 @@ table.data-table tr[data-task-id]:hover td { background: #f9fafb; }
 .todo-detail { display: none; margin: 6px 0 0 17px; padding: 8px 10px; background: #fff; border: 1px solid #e5e7eb; border-radius: 6px; font-size: 12px; color: #6b7280; }
 .todo-detail.open { display: block; }
 
+/* U-026: v_graph_visualizer -- class/data-* names match
+   docs/wireframes/v_graph_visualizer.html */
+.work-graph { position: relative; border: 1px dashed #d1d5db; border-radius: 8px; padding: 32px; background: #f9fafb; }
+.work-row { display: flex; gap: 24px; margin-bottom: 40px; justify-content: center; flex-wrap: wrap; }
+.work-row:last-child { margin-bottom: 0; }
+.work-node { border: 2px solid #d1d5db; border-radius: 8px; padding: 10px 14px; min-width: 140px; background: #fff; cursor: pointer; position: relative; font-size: 13px; }
+.work-node .node-id { font-weight: 600; }
+.work-node .node-skill { color: #6b7280; font-size: 11px; margin-top: 2px; }
+.work-node.status-pending { border-color: var(--status-pending); }
+.work-node.status-running { border-color: var(--status-running); background: #eff6ff; }
+.work-node.status-reflecting, .work-node.status-retrying { border-color: var(--status-reflecting); background: #fefce8; }
+.work-node.status-waiting_for_quota { border-color: var(--status-waiting-quota); background: #f0f9ff; }
+.work-node.status-waiting_for_quota::after { content: "🕐"; position: absolute; top: -8px; right: -8px; font-size: 14px; }
+.work-node.status-blocked, .work-node.status-failed { border-color: var(--status-blocked); background: #fef2f2; }
+.work-node.status-done { border-color: var(--status-done); background: #f0fdf4; }
+.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 12px; color: #6b7280; }
+.legend-item { display: flex; align-items: center; gap: 6px; }
+.legend-swatch { width: 14px; height: 14px; border-radius: 4px; border: 2px solid; }
+.legend-swatch.status-pending { border-color: var(--status-pending); }
+.legend-swatch.status-running { border-color: var(--status-running); }
+.legend-swatch.status-reflecting { border-color: var(--status-reflecting); }
+.legend-swatch.status-waiting_for_quota { border-color: var(--status-waiting-quota); }
+.legend-swatch.status-blocked { border-color: var(--status-blocked); }
+.legend-swatch.status-done { border-color: var(--status-done); }
+.tooltip { position: absolute; z-index: 10; background: #111827; color: #fff; font-size: 12px; padding: 8px 10px; border-radius: 6px; max-width: 260px; display: none; pointer-events: none; line-height: 1.5; }
+.tooltip.show { display: block; }
+
 ul.simple-list { list-style: none; margin: 0; padding: 0; font-size: 13px; }
 ul.simple-list li { padding: 8px 0; border-bottom: 1px solid #e5e7eb; display: flex; justify-content: space-between; }
 ul.simple-list li:last-child { border-bottom: none; }
diff --git a/src/task_query.py b/src/task_query.py
index 132cb5d..f3607a0 100644
--- a/src/task_query.py
+++ b/src/task_query.py
@@ -104,9 +104,15 @@ def get_task(conn, task_id):
 
 
 def _work_nodes_for_run(conn, run_id):
+    # input_schema_ref/output_schema_ref/quota_limit_type/quota_wait_started_at
+    # added for U-026's hover tooltip + waiting_for_quota display (02-V §2.7:
+    # "tooltip 展示 input_schema_ref/output_schema_ref/retry_count 摘要...
+    # waiting_for_quota 态额外展示 quota_limit_type 和已等待时长") -- not
+    # needed by U-025's to-do tree, which is why they weren't here yet.
     rows = conn.execute(
         "SELECT node_exec_id, node_id, subagent_type, status, retry_count, input_payload, "
-        "output_payload, reflection_notes, git_worktree_ref "
+        "output_payload, reflection_notes, git_worktree_ref, input_schema_ref, output_schema_ref, "
+        "quota_limit_type, quota_wait_started_at "
         "FROM work_node_execution WHERE run_id = ? ORDER BY node_exec_id",
         (run_id,),
     ).fetchall()
@@ -117,6 +123,8 @@ def _work_nodes_for_run(conn, run_id):
             "input_payload": json.loads(n[5]) if n[5] else None,
             "output_payload": json.loads(n[6]) if n[6] else None,
             "reflection_notes": n[7], "git_worktree_ref": n[8],
+            "input_schema_ref": n[9], "output_schema_ref": n[10],
+            "quota_limit_type": n[11], "quota_wait_started_at": n[12],
         }
         for n in rows
     ]
diff --git a/src/test_task_query.py b/src/test_task_query.py
index bf232d8..9b27e1d 100644
--- a/src/test_task_query.py
+++ b/src/test_task_query.py
@@ -145,6 +145,34 @@ class GetTaskTest(TaskQueryTestBase):
         self.assertEqual(run["nodes"][0]["node_id"], "n1")
         self.assertEqual(run["nodes"][0]["status"], "done")
         self.assertEqual(run["nodes"][0]["output_payload"], {"x": 1})
+        self.assertEqual(run["nodes"][0]["input_schema_ref"], "in.json")
+        self.assertEqual(run["nodes"][0]["output_schema_ref"], "out.json")
+
+    def test_work_node_includes_quota_wait_fields_for_v_graph_visualizer(self):
+        # U-026: v_graph_visualizer's waiting_for_quota state needs
+        # quota_limit_type + how long it's been waiting (02-V §2.7)
+        self._insert_task("task-1")
+        self.conn.execute(
+            "INSERT INTO work_graph_run (run_id, task_id, org_node, graph_manifest, status) "
+            "VALUES ('run-1', 'task-1', 'coder', '{}', 'running')"
+        )
+        self.conn.execute(
+            "INSERT INTO skill (skill_id, owner_org_node, file_path, current_git_commit_sha, source, status) "
+            "VALUES ('skill-1', 'coder', 'skills/skill-1/', 'sha', 'new', 'active')"
+        )
+        self.conn.execute(
+            "INSERT INTO work_node_execution (node_exec_id, run_id, node_id, subagent_type, skill_ref, "
+            "input_schema_ref, output_schema_ref, input_payload, status, quota_limit_type, "
+            "quota_wait_started_at) "
+            "VALUES ('node-1', 'run-1', 'n1', 'coder', 'skill-1', 'in.json', 'out.json', '{}', "
+            "'waiting_for_quota', 'session', '2026-07-31 09:00:00')"
+        )
+        self.conn.commit()
+
+        result = task_query.get_task(self.conn, "task-1")
+        node = result["work_graph_runs"][0]["nodes"][0]
+        self.assertEqual(node["quota_limit_type"], "session")
+        self.assertEqual(node["quota_wait_started_at"], "2026-07-31 09:00:00")
 
 
 if __name__ == "__main__":