diff --git a/PROJECT_COMPLETION_TRACKER.md b/PROJECT_COMPLETION_TRACKER.md
index f9d4f99..e411e7a 100644
--- a/PROJECT_COMPLETION_TRACKER.md
+++ b/PROJECT_COMPLETION_TRACKER.md
@@ -9,7 +9,7 @@ turn-by-turn continuation notes and next-batch execution records.
 ## Current Status
 
 - Active continuation file: `text14.txt`
-- Latest completed batch: project release readiness artifact URL workflow summary view-model SDK API
+- Latest completed batch: project release artifact URL workflow SDK gate
 - Latest relevant commit: use `git log -1 --oneline` after each committed batch
 - Working tree at tracker creation: clean
 - Required policy: LinuxCNC remains the only CNC semantic source
@@ -43,12 +43,12 @@ The project is complete for the current scope when all of the following are true
 | Native nc_files baseline | Stable | Last recorded Layer 1: `total 107`, `pass 101`, `expected_fail 6`, `unexpected_fail 0`. |
 | Native sim configs baseline | Stable | Last recorded Layer 2: `total 159`, `pass 151`, `expected_fail 8`, `unexpected_fail 0`. |
 | OPFS/session persistence | Stable for current scope | Browser smoke passes, SDK re-exports OPFS/session helpers including `readMachineSessionReadiness()` and `createMachineSessionPersistenceSummary()`, the UI exposes `getMachineSessionPersistenceSummary()`, and `docs/opfs-session-persistence.md` defines the project-level release gate. |
-| SDK/API surface | Stable for current scope | SDK re-exports core, OPFS/session readiness/load helpers, sim-config staging, project release gate manifest/result matrix/action-plan/readiness summary view-model, project release readiness report/artifact JSON workflow/artifact URL workflow summary/artifact validation summary/action-plan plus URL loading workflow, INI panel entry/launcher/control-page/shell/workflow overview helpers, the session readiness workflow report, and the shell API surface inventory with a Node surface smoke. |
+| SDK/API surface | Stable for current scope | SDK re-exports core, OPFS/session readiness/load helpers, sim-config staging, project release gate manifest/result matrix/action-plan/readiness summary view-model, project release readiness report/artifact JSON workflow/artifact URL workflow summary/artifact validation summary/action-plan plus URL loading workflow, INI panel entry/launcher/control-page/shell/workflow overview helpers, the session readiness workflow report, and the shell API surface inventory with dedicated Node smokes. |
 | Browser/UI workflow | Stable for current scope | Workflow overview embedding mount DOM closure is complete, and INI panel session workflows plus read-only control/shell handoff expose, render, fetch, validate, summarize, and report OPFS/session readiness, OPFS/session persistence summary, release readiness artifact validation/rendering/URL workflow summaries, and API surface inventory before loading or reading WASM session state. |
 | Workflow overview embedding | Stable for current scope | Report/display/render, DOM contract/readiness/renderer, mount result/display/render, mount DOM contract/readiness/renderer/wrapper exist. |
 | Host/runtime boundary proof | Stable blocked state | Host smoke passes; runtime families remain blocked and `docs/host-runtime-boundary-handoff.md` records host readiness, promotion blockers, dispatch, and evidence gates. |
 | Documentation/release gate | Stable for current scope | `docs/project-release-handoff.md` links README, panel entry, SDK, OPFS/session, sim-config, host/runtime, source reuse, drift, tracker acceptance paths, and the machine-readable release readiness report/artifact. |
-| Project release gate wrapper | Stable | `tests/host/verify_project_release_gate.sh` runs the documented minimum release validation commands including the release artifact URL browser workflow gate, writes `build/project-release-readiness.json`, verifies embedded gate manifest/result matrix/action-plan evidence through the SDK artifact validation workflow, and ends with `project_release_gate=ok`. |
+| Project release gate wrapper | Stable | `tests/host/verify_project_release_gate.sh` runs the documented minimum release validation commands including the release artifact URL browser workflow gate and SDK URL workflow gate, writes `build/project-release-readiness.json`, verifies embedded gate manifest/result matrix/action-plan evidence through the SDK artifact validation workflow, and ends with `project_release_gate=ok`. |
 
 ## Blocked Runtime Families
 
diff --git a/text14.txt b/text14.txt
index 7fdfca9..e08f371 100644
--- a/text14.txt
+++ b/text14.txt
@@ -3308,6 +3308,63 @@ ui_node_smokes=ok
 继续只做实质能力推进。优先选择可执行 gate、SDK/API surface、或真实 browser workflow；
 不要做只整理断言或局部常量化的批次。
 
+五十五、2026-06-16 继续执行记录：project release artifact URL workflow SDK gate
+
+本轮继续按“每批必须产出可调用 API、可验证 workflow、可执行 gate、或真实 UI/browser 能力”推进，
+把 SDK 侧 release artifact URL workflow 从 surface 测试中的局部断言提升为独立可执行 gate。外部
+CI 现在可以单独运行这个 gate 验证 caller-provided fetch、ready URL workflow、summary view-model、
+missing input、HTTP failure 和 thrown fetch error。
+
+完成内容：
+
+- 新增可执行 SDK gate：
+  - `tests/sdk/node/verify_project_release_artifact_url_workflow.mjs`；
+  - `tests/sdk/node/verify_project_release_artifact_url_workflow.sh`；
+- 新 gate 覆盖：
+  - fetch 收到 caller-provided artifact URL；
+  - ready artifact URL workflow；
+  - ready URL workflow summary view-model；
+  - missing `artifactUrl/fetchRef`；
+  - HTTP failure；
+  - thrown fetch error；
+  - blocked workflow 的 next-command action-plan；
+- `tests/sdk/node/verify_sdk_surface.sh` 聚合运行新 gate；
+- `tests/host/verify_project_release_gate.sh` 显式运行新 SDK URL workflow gate；
+- `runtime/sdk/README.md` 记录新 gate 命令和输出；
+- `docs/project-release-handoff.md` 把新 gate 加入 release validation commands 和 expected SDK outputs；
+- `tests/docs/node/verify_project_release_handoff_docs.mjs` 覆盖新 gate 命令和输出；
+- `PROJECT_COMPLETION_TRACKER.md` 同步 latest completed batch、SDK/API surface 和 release gate wrapper 状态；
+- 未新增控制按钮；
+- 未执行 opt-in runtime probes；
+- 未解析 G-code；
+- 未解释 canonical events；
+- 未新增 JS CNC 语义；
+- 未 promotion blocked runtime family；
+- 未改变 LinuxCNC interpreter、tool、parameter、planner、kinematics、remap 或 LinuxCNC-owned
+  runtime semantics。
+
+验证已通过（先行 targeted）：
+
+```bash
+wasm-port/tests/sdk/node/verify_project_release_artifact_url_workflow.sh
+wasm-port/tests/sdk/node/verify_sdk_surface.sh
+wasm-port/tests/docs/node/verify_project_release_handoff_docs.sh
+```
+
+关键输出：
+
+```text
+project_release_artifact_url_workflow_node_smoke=ok
+sdk_surface_node_smoke=ok
+project_release_gate_manifest_node_smoke=ok
+project_release_handoff_docs_node_smoke=ok
+```
+
+下一步工作计划：
+
+继续只做实质能力推进。优先选择可执行 gate、SDK/API surface、或真实 browser workflow；
+不要做只整理断言或局部常量化的批次。
+
 五十四、2026-06-16 继续执行记录：project release readiness artifact URL workflow summary view-model SDK API
 
 本轮继续按“每批必须产出可调用 API、可验证 workflow、可执行 gate、或真实 UI/browser 能力”推进，
diff --git a/wasm-port/docs/project-release-handoff.md b/wasm-port/docs/project-release-handoff.md
index 308e531..874a570 100644
--- a/wasm-port/docs/project-release-handoff.md
+++ b/wasm-port/docs/project-release-handoff.md
@@ -113,6 +113,7 @@ SKIP_INTERP_BUILD=1 wasm-port/tests/wasm/node/verify_sim_configs_inventory_wasm.
 SKIP_INI_BUILD=1 SKIP_INTERP_BUILD=1 wasm-port/tests/browser/verify_ini_panel_browser.sh
 SKIP_INI_BUILD=1 SKIP_INTERP_BUILD=1 wasm-port/tests/browser/verify_release_artifact_url_workflow_browser.sh
 wasm-port/tests/ui/node/verify_ui_node_smokes.sh
+wasm-port/tests/sdk/node/verify_project_release_artifact_url_workflow.sh
 wasm-port/tests/host/verify_host_smokes.sh
 ```
 
@@ -151,6 +152,7 @@ opfs_session_docs_node_smoke=ok
 sim_configs_coverage_docs_node_smoke=ok
 host_runtime_boundary_docs_node_smoke=ok
 sdk_surface_node_smoke=ok
+project_release_artifact_url_workflow_node_smoke=ok
 ```
 
 The expected browser INI panel smoke outputs include:
diff --git a/wasm-port/runtime/sdk/README.md b/wasm-port/runtime/sdk/README.md
index e01b259..9af74bd 100644
--- a/wasm-port/runtime/sdk/README.md
+++ b/wasm-port/runtime/sdk/README.md
@@ -252,6 +252,10 @@ action-plan output without executing release gates.
 `createProjectReleaseReadinessArtifactUrlWorkflowSummaryViewModel()` turns the
 URL workflow result into stable dashboard status text and rows for ready,
 missing-input, fetch-failure, and artifact-validation-blocked states.
+`tests/sdk/node/verify_project_release_artifact_url_workflow.sh` is the
+dedicated executable SDK gate for that URL workflow. It verifies caller-provided
+fetch handling, ready summaries, missing input, HTTP failure, thrown fetch
+errors, and ends with `project_release_artifact_url_workflow_node_smoke=ok`.
 
 ## OPFS/session persistence exports
 
diff --git a/wasm-port/tests/docs/node/verify_project_release_handoff_docs.mjs b/wasm-port/tests/docs/node/verify_project_release_handoff_docs.mjs
index 58a56f2..8d0db0b 100644
--- a/wasm-port/tests/docs/node/verify_project_release_handoff_docs.mjs
+++ b/wasm-port/tests/docs/node/verify_project_release_handoff_docs.mjs
@@ -57,8 +57,10 @@ for (const phrase of [
   "verify_project_release_gate.sh",
   "build/project-release-readiness.json",
   "verify_project_release_readiness_artifact.sh",
+  "verify_project_release_artifact_url_workflow.sh",
   "host_wasm_opfs_browser_smokes=ok",
   "project_release_readiness_artifact_node_smoke=ok",
+  "project_release_artifact_url_workflow_node_smoke=ok",
   "project_release_gate=ok",
   "sim_configs_wasm_node_inventory_unexpected_fail=0",
   "browser_ini_shell_integration_workflow_smoke=ok",
@@ -91,6 +93,7 @@ for (const phrase of [
   "verify_host_smokes.sh",
   "write_project_release_readiness_artifact.mjs",
   "verify_project_release_readiness_artifact.sh",
+  "verify_project_release_artifact_url_workflow.sh",
   "project_release_gate=ok",
 ]) {
   assert.match(projectReleaseGateText, literalRegExp(phrase));
@@ -123,6 +126,8 @@ for (const phrase of [
   "loadIniPanelShellWorkflowOverviewReleaseReadinessArtifactUrl()",
   "loadProjectReleaseReadinessArtifactUrlWorkflow()",
   "createProjectReleaseReadinessArtifactUrlWorkflowSummaryViewModel()",
+  "verify_project_release_artifact_url_workflow.sh",
+  "project_release_artifact_url_workflow_node_smoke=ok",
   "build/project-release-readiness.json",
   "INI panel shell handoff exports",
   "createIniPanelShellApiSurfaceInventory()",
diff --git a/wasm-port/tests/host/verify_project_release_gate.sh b/wasm-port/tests/host/verify_project_release_gate.sh
index 96b6dc9..602c82d 100755
--- a/wasm-port/tests/host/verify_project_release_gate.sh
+++ b/wasm-port/tests/host/verify_project_release_gate.sh
@@ -14,6 +14,7 @@ SKIP_INTERP_BUILD=1 "$ROOT_DIR/tests/wasm/node/verify_sim_configs_inventory_wasm
 SKIP_INI_BUILD=1 SKIP_INTERP_BUILD=1 "$ROOT_DIR/tests/browser/verify_ini_panel_browser.sh"
 SKIP_INI_BUILD=1 SKIP_INTERP_BUILD=1 "$ROOT_DIR/tests/browser/verify_release_artifact_url_workflow_browser.sh"
 "$ROOT_DIR/tests/ui/node/verify_ui_node_smokes.sh"
+"$ROOT_DIR/tests/sdk/node/verify_project_release_artifact_url_workflow.sh"
 "$ROOT_DIR/tests/host/verify_host_smokes.sh"
 
 node "$ROOT_DIR/tests/host/write_project_release_readiness_artifact.mjs"
diff --git a/wasm-port/tests/sdk/node/verify_project_release_artifact_url_workflow.mjs b/wasm-port/tests/sdk/node/verify_project_release_artifact_url_workflow.mjs
new file mode 100644
index 0000000..ac13b38
--- /dev/null
+++ b/wasm-port/tests/sdk/node/verify_project_release_artifact_url_workflow.mjs
@@ -0,0 +1,105 @@
+import assert from "node:assert/strict";
+
+import {
+  createProjectReleaseGateManifest,
+  createProjectReleaseReadinessArtifactUrlWorkflowSummaryViewModel,
+  createProjectReleaseReadinessReport,
+  loadProjectReleaseReadinessArtifactUrlWorkflow,
+} from "../../../runtime/sdk/src/index.js";
+
+const manifest = createProjectReleaseGateManifest();
+const readyArtifactJson = JSON.stringify(createProjectReleaseReadinessReport({
+  gateResults: Object.fromEntries(manifest.gateIds.map((id) => [id, true])),
+}));
+
+let fetchedUrl = null;
+const readyWorkflow = await loadProjectReleaseReadinessArtifactUrlWorkflow({
+  artifactUrl: "/project-release-readiness.json",
+  fetchRef: async (url) => {
+    fetchedUrl = url;
+    return {
+      ok: true,
+      status: 200,
+      text: async () => readyArtifactJson,
+    };
+  },
+});
+const readySummary = createProjectReleaseReadinessArtifactUrlWorkflowSummaryViewModel(readyWorkflow);
+
+assert.equal(fetchedUrl, "/project-release-readiness.json");
+assert.equal(readyWorkflow.apiName, "project-release-readiness-artifact-url-workflow");
+assert.equal(readyWorkflow.workflowVersion, 1);
+assert.equal(readyWorkflow.ready, true);
+assert.equal(readyWorkflow.fetched, true);
+assert.equal(readyWorkflow.httpStatus, 200);
+assert.equal(readyWorkflow.fetchError, null);
+assert.equal(readyWorkflow.jsonWorkflow.ready, true);
+assert.equal(readyWorkflow.validation.ready, true);
+assert.equal(readyWorkflow.actionPlan.ready, true);
+assert.equal(readySummary.apiName, "project-release-readiness-artifact-url-workflow-summary-view-model");
+assert.equal(readySummary.statusLine, "Ready: Artifact URL workflow complete");
+assert.deepEqual(
+  readySummary.rows.map(({ id, value }) => [id, value]),
+  [
+    ["artifact-url", "/project-release-readiness.json"],
+    ["fetch", "ready (200)"],
+    ["json-workflow", "ready"],
+    ["artifact-validation", "ready"],
+    ["next-command", "none"],
+    ["missing", "none"],
+  ],
+);
+
+const missingInputWorkflow = await loadProjectReleaseReadinessArtifactUrlWorkflow({
+  artifactUrl: "",
+  fetchRef: null,
+});
+const missingInputSummary = createProjectReleaseReadinessArtifactUrlWorkflowSummaryViewModel(
+  missingInputWorkflow,
+);
+assert.equal(missingInputWorkflow.ready, false);
+assert.equal(missingInputWorkflow.fetched, false);
+assert.deepEqual(missingInputWorkflow.missing.slice(0, 2), ["artifact-url", "fetch"]);
+assert.match(missingInputSummary.statusLine, /^Blocked: artifact-url, fetch/);
+assert.equal(missingInputSummary.rows.find(({ id }) => id === "artifact-url")?.value, "missing");
+
+const httpFailureWorkflow = await loadProjectReleaseReadinessArtifactUrlWorkflow({
+  artifactUrl: "/missing.json",
+  fetchRef: async () => ({
+    ok: false,
+    status: 404,
+    text: async () => "",
+  }),
+});
+const httpFailureSummary = createProjectReleaseReadinessArtifactUrlWorkflowSummaryViewModel(
+  httpFailureWorkflow,
+);
+assert.equal(httpFailureWorkflow.ready, false);
+assert.equal(httpFailureWorkflow.fetched, false);
+assert.equal(httpFailureWorkflow.httpStatus, 404);
+assert.match(httpFailureWorkflow.fetchError, /404/);
+assert.equal(httpFailureWorkflow.missing[0], "artifact-fetch");
+assert.equal(
+  httpFailureWorkflow.actionPlan.nextCommand,
+  "wasm-port/tests/host/verify_project_release_gate.sh",
+);
+assert.match(httpFailureSummary.statusLine, /^Blocked: artifact-fetch/);
+assert.equal(httpFailureSummary.rows.find(({ id }) => id === "fetch")?.value, "blocked");
+
+const thrownFetchWorkflow = await loadProjectReleaseReadinessArtifactUrlWorkflow({
+  artifactUrl: "/throws.json",
+  fetchRef: async () => {
+    throw new Error("network unavailable");
+  },
+});
+const thrownFetchSummary = createProjectReleaseReadinessArtifactUrlWorkflowSummaryViewModel(
+  thrownFetchWorkflow,
+);
+assert.equal(thrownFetchWorkflow.ready, false);
+assert.equal(thrownFetchWorkflow.fetched, false);
+assert.equal(thrownFetchWorkflow.httpStatus, null);
+assert.equal(thrownFetchWorkflow.fetchError, "network unavailable");
+assert.equal(thrownFetchWorkflow.missing[0], "artifact-fetch");
+assert.match(thrownFetchSummary.statusLine, /^Blocked: artifact-fetch/);
+
+console.log("project_release_artifact_url_workflow_node_smoke=ok");
diff --git a/wasm-port/tests/sdk/node/verify_project_release_artifact_url_workflow.sh b/wasm-port/tests/sdk/node/verify_project_release_artifact_url_workflow.sh
new file mode 100755
index 0000000..66e31c1
--- /dev/null
+++ b/wasm-port/tests/sdk/node/verify_project_release_artifact_url_workflow.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "$0")/../../.." && pwd)"
+
+node "$ROOT_DIR/tests/sdk/node/verify_project_release_artifact_url_workflow.mjs"
diff --git a/wasm-port/tests/sdk/node/verify_sdk_surface.sh b/wasm-port/tests/sdk/node/verify_sdk_surface.sh
index 38dd35d..1c860ff 100755
--- a/wasm-port/tests/sdk/node/verify_sdk_surface.sh
+++ b/wasm-port/tests/sdk/node/verify_sdk_surface.sh
@@ -5,3 +5,4 @@ ROOT_DIR="$(cd "$(dirname "$0")/../../.." && pwd)"
 
 node "$ROOT_DIR/tests/sdk/node/verify_sdk_surface.mjs"
 "$ROOT_DIR/tests/sdk/node/verify_project_release_gate_manifest.sh"
+"$ROOT_DIR/tests/sdk/node/verify_project_release_artifact_url_workflow.sh"