diff --git a/docs/50_Step记录/STEP-073_QBIN2_V4_Core与通用FieldProfileValidator_v4.md b/docs/50_Step记录/STEP-073_QBIN2_V4_Core与通用FieldProfileValidator_v4.md
new file mode 100644
index 000000000..45800018e
--- /dev/null
+++ b/docs/50_Step记录/STEP-073_QBIN2_V4_Core与通用FieldProfileValidator_v4.md
@@ -0,0 +1,45 @@
+# STEP-073 — QBIN2 V4 Core 与通用 Field Profile Validator 最终关闭修正 v4
+
+状态：完成
+
+日期：2026-09-13
+
+## 基线
+
+- 开始 HEAD：`0b66a5cd30e91423cbc864a327a53bed06cae91c`。
+- 开始工作区含 STEP-062 文档修改及多项历史 untracked 文件；本 Step 未修改、暂存或提交它们。
+
+## 目标
+
+关闭独立审计在实际重链 `mbgl-test-runner` 后发现的三项问题：Frame 的唯一共享 validity domain、实际已知 Core semantic 的错误优先级，以及 ForecastClock 测试的 pause/resume 语义。
+
+## 完成项
+
+- [x] `DecodedFieldFrame` 允许空 numeric `planes[]`，完整 designated validity 仍结构合法；所缺 required numeric plane 由 Validator 返回 `MissingRequiredPlane`。
+- [x] designated validity 强制 `Validity/Bitset/NONE/group0/None/REQUIRED`、cell count 与 bit payload 长度一致，并与 `validityBits` 使用同一 `shared_ptr`；任一违反均为 `InvalidFrame`。
+- [x] 禁止 `planes[]` 出现第二张 Validity plane，确保一帧只有唯一共享 validity domain。
+- [x] 保留静态数据表驱动的 Core semantic contract，并在 required-plane descriptor 匹配前检查实际 plane；semantic 1 Scalar 伪装、semantic 10 component/group 冲突均返回 `SemanticContractMismatch`。
+- [x] unknown Scalar 及 opaque unit 的可扩展行为保持；Direction circular quantization v3 规则未变。
+- [x] ForecastClock 测试在 `pause()` 后显式 `play()`，未改变生产 `pause()` 语义。
+
+## 允许修改
+
+仅修改 Field Runtime Core、通用 Validator、对应 C++ 测试和本 Step 文档/报告/开发记录。
+
+## 禁止修改确认
+
+未修改 QBIN2 Decoder、Binding/Projection、Renderer、shader、JNI、`platform/android/**`、`packages/maplibre-particle-rn/**`、`integration/react-native/**`、Style JSON/source schema 或 V3 `submitField(...)` 路径；未执行 Android Gradle、APK、ADB、真机、Jest 或 iOS/Metal。
+
+## 验证
+
+构建/测试完整输出均落入 `/tmp` 限流日志（仓库未提供 build-output-throttle 指定的 helper script，仅在失败时读取有限末尾窗口）。
+
+- [x] `cmake --build build-linux-opengl --target mbgl-test-runner -j3`：实际重编译并重链 PASS。
+- [x] `mbgl-test-runner --gtest_list_tests`：确认包含 `ParticleFieldProfileValidator.` 与 `ParticleFieldRuntime.`。
+- [x] `mbgl-test-runner --gtest_filter='ParticleFieldRuntime.*:ParticleFieldProfileValidator.*'`：实际运行 11 tests，11 PASS，0 failed；绝非 0 tests。
+- [x] `mbgl-test-runner --gtest_filter='Source.ParticleFieldDataAdapter*:Source.RasterArrayTimeline*:Source.HostField*'`：实际运行 11 tests，11 PASS，0 failed。
+- [x] `git diff --check`：PASS。
+
+## 当前结果、阻塞与下一步
+
+STEP-073 v4 的关闭条件已满足，无范围内阻塞。停止于此，等待 ChatGPT 独立复验；不进入 STEP-074。
diff --git a/docs/报告/STEP-073_QBIN2_V4_Core与通用FieldProfileValidator_Codex完成报告_v4.md b/docs/报告/STEP-073_QBIN2_V4_Core与通用FieldProfileValidator_Codex完成报告_v4.md
new file mode 100644
index 000000000..517512557
--- /dev/null
+++ b/docs/报告/STEP-073_QBIN2_V4_Core与通用FieldProfileValidator_Codex完成报告_v4.md
@@ -0,0 +1,28 @@
+# STEP-073 QBIN2 V4 Core 与通用 Field Profile Validator 完成报告 v4
+
+日期：2026-09-13
+
+## 结果
+
+STEP-073 最终关闭修正完成。Frame Core 现在明确维护 single shared validity invariant；空 numeric plane list 不再被结构层误判。Validator 在 required descriptor 匹配前拒绝实际保留 Core semantic 的物理含义冲突，unknown Scalar opaque 行为与 Direction v3 量化规则保持。
+
+## 实际修改
+
+- `DecodedFieldFrame::isStructurallyValid()` 对 designated validity 强制 `Validity`、`Bitset`、`NONE`、group 0、`None` component、`REQUIRED`、正确 cells/bit payload，并要求 descriptor storage 与 `validityBits` 是同一共享引用；常规 `planes[]` 不允许任何 Validity plane。
+- 删除空 `planes[]` 的结构拒绝。于是完整 validity-only Frame 保持结构有效，Generic Validator 对缺失 Profile numeric required plane 返回 `MissingRequiredPlane`。
+- 以既有静态协议表先核验 actual planes，故 semantic 10 的 component/group 错误，以及 semantic 1 伪装成 Scalar，都优先返回 `SemanticContractMismatch`，而不是 `MissingRequiredPlane` 或 `PlaneDescriptorMismatch`。
+- 测试新增 second validity、designated validity descriptor 各字段、`requiredFlag=false` 与 storage identity 的 fail-closed 覆盖；修正 ForecastClock pause 后的测试恢复播放。
+
+## 独立 runner 验证
+
+`mbgl-test-runner` 本体已重新构建和链接，并通过 `--gtest_list_tests` 确认加载 `ParticleFieldProfileValidator.`、`ParticleFieldRuntime.`。
+
+- V4 filter：实际 `Running 11 tests`，`PASSED 11 tests`，failed=0。
+- V3 定向回归：实际 `Running 11 tests`，`PASSED 11 tests`，failed=0。
+- `git diff --check`：PASS。
+
+构建/测试输出按节流要求写入 `/tmp` 日志；仓库当前不存在 skill 所指的 `scripts/run_limited.py` helper。首次 sandbox 构建因只读 ccache 失败，获准后以同一受限日志模式重跑并成功，不涉及源代码失败。
+
+## 范围与未完成项
+
+未触及 QBIN2 Decoder、Binding/Projection、Renderer、JNI、Android、RN、Style schema 或 V3 `submitField(...)`。未执行 Android Gradle、APK、ADB、真机、Jest、iOS/Metal。没有范围内未完成项；按任务要求停止，等待独立复验，不进入 STEP-074。
diff --git a/src/mbgl/particle/field/field_profile_validator.cpp b/src/mbgl/particle/field/field_profile_validator.cpp
index 1cf295350..b78a99482 100644
--- a/src/mbgl/particle/field/field_profile_validator.cpp
+++ b/src/mbgl/particle/field/field_profile_validator.cpp
@@ -99,6 +99,15 @@ FieldProfileValidationResult FieldProfileValidator::validate(const ResolvedField
     actual.push_back(&frame.validityPlane);
     for (const auto& plane : frame.planes) actual.push_back(&plane);
 
+    // Inspect actual reserved Core semantics before profile matching. Otherwise
+    // an invalid known semantic can be hidden behind a missing/mismatched
+    // profile descriptor instead of reporting its protocol violation.
+    for (const auto plane : actual) {
+        if (!matchesCoreSemanticContract(plane->key.semanticID, plane->valueClass, plane->unitID,
+                                         plane->key.groupID, plane->key.component))
+            return result(FieldProfileValidationCode::SemanticContractMismatch, "actual Core semantic descriptor");
+    }
+
     for (const auto& required : contract.requiredPlanes) {
         const auto same = std::find_if(actual.begin(), actual.end(), [&required](const PlaneRef plane) {
             return sameKey(required, *plane);
@@ -109,9 +118,6 @@ FieldProfileValidationResult FieldProfileValidator::validate(const ResolvedField
     }
 
     for (const auto plane : actual) {
-        if (!matchesCoreSemanticContract(plane->key.semanticID, plane->valueClass, plane->unitID, plane->key.groupID,
-                                         plane->key.component))
-            return result(FieldProfileValidationCode::SemanticContractMismatch, "actual Core semantic descriptor");
         const auto declared = std::find_if(contract.requiredPlanes.begin(), contract.requiredPlanes.end(),
                                            [plane](const FieldPlaneRequirement& requirement) {
                                                return matches(requirement, *plane);
diff --git a/src/mbgl/particle/field/field_runtime.cpp b/src/mbgl/particle/field/field_runtime.cpp
index 020720bf4..769c5b7c3 100644
--- a/src/mbgl/particle/field/field_runtime.cpp
+++ b/src/mbgl/particle/field/field_runtime.cpp
@@ -99,16 +99,22 @@ bool DecodedFieldGrid::operator==(const DecodedFieldGrid& other) const {
 
 bool DecodedFieldFrame::isStructurallyValid() const {
     if (!frameContentIdentity.isValid() || referenceTimeMs == 0 || !grid.isValid() || !validityBits ||
-        validityBits->empty() || validityContentIdentity.empty() || planes.empty()) return false;
+        validityBits->empty() || validityContentIdentity.empty()) return false;
     const uint64_t cells = static_cast<uint64_t>(grid.width) * grid.height;
     const uint64_t expectedValidityBytes = (cells + 7u) / 8u;
     if (validityBits->size() != expectedValidityBytes) return false;
-    if (!validityPlane.isStructurallyValid(cells) || validityPlane.contentIdentity != validityContentIdentity ||
-        validityPlane.storage != validityBits) return false;
+    if (!validityPlane.isStructurallyValid(cells) || validityPlane.valueClass != FieldValueClass::Validity ||
+        validityPlane.dtype != FieldDType::Bitset || validityPlane.unitID != FieldUnitNone ||
+        validityPlane.key.groupID != 0 || validityPlane.key.component != FieldComponent::None ||
+        !validityPlane.requiredFlag || validityPlane.contentIdentity != validityContentIdentity ||
+        validityPlane.storage != validityBits)
+        return false;
     std::set<FieldPlaneKey> keys;
     if (!keys.insert(validityPlane.key).second) return false;
     for (const auto& plane : planes) {
-        if (!plane.isStructurallyValid(cells) || !keys.insert(plane.key).second) return false;
+        if (!plane.isStructurallyValid(cells) || plane.valueClass == FieldValueClass::Validity ||
+            !keys.insert(plane.key).second)
+            return false;
     }
     return true;
 }
diff --git a/test/particle/field_runtime.test.cpp b/test/particle/field_runtime.test.cpp
index e9037596e..0533c53b1 100644
--- a/test/particle/field_runtime.test.cpp
+++ b/test/particle/field_runtime.test.cpp
@@ -71,6 +71,7 @@ TEST(ParticleFieldProfileValidator, AcceptsGenericProfileAndOpaqueScalarUnit) {
 TEST(ParticleFieldProfileValidator, EnforcesRequiredPlanesAndAdditionalPlanePolicy) {
     auto c = contract(); auto f = frame();
     f.planes.clear();
+    EXPECT_TRUE(f.isStructurallyValid());
     EXPECT_EQ(validate(c, f), particle::FieldProfileValidationCode::MissingRequiredPlane);
     f = frame(); f.planes.front().unitID = 99;
     EXPECT_EQ(validate(c, f), particle::FieldProfileValidationCode::PlaneDescriptorMismatch);
@@ -85,6 +86,42 @@ TEST(ParticleFieldProfileValidator, EnforcesRequiredPlanesAndAdditionalPlanePoli
     EXPECT_EQ(validate(c, f), particle::FieldProfileValidationCode::Accepted);
 }
 
+TEST(ParticleFieldProfileValidator, EnforcesSingleSharedValidityStructuralInvariant) {
+    auto f = frame();
+    const auto numbers = f.planes.front().storage;
+
+    f.planes.push_back(plane(901, particle::FieldValueClass::Validity, particle::FieldUnitNone, 0,
+                             particle::FieldComponent::None, particle::FieldDType::Bitset, false, numbers, "second-validity"));
+    EXPECT_FALSE(f.isStructurallyValid());
+    EXPECT_EQ(validate(contract(), f), particle::FieldProfileValidationCode::InvalidFrame);
+
+    f = frame();
+    f.validityPlane.requiredFlag = false;
+    EXPECT_FALSE(f.isStructurallyValid());
+    EXPECT_EQ(validate(contract(), f), particle::FieldProfileValidationCode::InvalidFrame);
+
+    f = frame(); f.validityPlane.valueClass = particle::FieldValueClass::Scalar;
+    EXPECT_FALSE(f.isStructurallyValid());
+    EXPECT_EQ(validate(contract(), f), particle::FieldProfileValidationCode::InvalidFrame);
+    f = frame(); f.validityPlane.dtype = particle::FieldDType::UInt8;
+    EXPECT_FALSE(f.isStructurallyValid());
+    EXPECT_EQ(validate(contract(), f), particle::FieldProfileValidationCode::InvalidFrame);
+    f = frame(); f.validityPlane.unitID = particle::FieldUnitMetersPerSecond;
+    EXPECT_FALSE(f.isStructurallyValid());
+    EXPECT_EQ(validate(contract(), f), particle::FieldProfileValidationCode::InvalidFrame);
+    f = frame(); f.validityPlane.key.groupID = 1;
+    EXPECT_FALSE(f.isStructurallyValid());
+    EXPECT_EQ(validate(contract(), f), particle::FieldProfileValidationCode::InvalidFrame);
+    f = frame(); f.validityPlane.key.component = particle::FieldComponent::UEast;
+    EXPECT_FALSE(f.isStructurallyValid());
+    EXPECT_EQ(validate(contract(), f), particle::FieldProfileValidationCode::InvalidFrame);
+
+    f = frame();
+    f.validityPlane.storage = std::make_shared<const std::vector<uint8_t>>(*f.validityBits);
+    EXPECT_FALSE(f.isStructurallyValid());
+    EXPECT_EQ(validate(contract(), f), particle::FieldProfileValidationCode::InvalidFrame);
+}
+
 TEST(ParticleFieldProfileValidator, EnforcesVelocityDirectionAndValidityCoreRules) {
     EXPECT_EQ(particle::FieldUnitNone, 0);
     EXPECT_EQ(particle::FieldUnitMetersPerSecond, 1);
@@ -121,11 +158,11 @@ TEST(ParticleFieldProfileValidator, EnforcesVelocityDirectionAndValidityCoreRule
     c.requiredPlanes.front().unitID = 2;
     EXPECT_EQ(validate(c, f), particle::FieldProfileValidationCode::SemanticContractMismatch);
     c = contract(); f = frame(); f.validityPlane.dtype = particle::FieldDType::UInt8;
-    EXPECT_EQ(validate(c, f), particle::FieldProfileValidationCode::InvalidCoreUnit);
+    EXPECT_EQ(validate(c, f), particle::FieldProfileValidationCode::InvalidFrame);
     f = frame(); f.validityPlane.unitID = 1;
-    EXPECT_EQ(validate(c, f), particle::FieldProfileValidationCode::InvalidCoreUnit);
+    EXPECT_EQ(validate(c, f), particle::FieldProfileValidationCode::InvalidFrame);
     f = frame(); f.validityPlane.valueClass = particle::FieldValueClass::Scalar;
-    EXPECT_EQ(validate(c, f), particle::FieldProfileValidationCode::InvalidCoreUnit);
+    EXPECT_EQ(validate(c, f), particle::FieldProfileValidationCode::InvalidFrame);
 }
 
 TEST(ParticleFieldProfileValidator, EnforcesReservedCoreSemanticContractsFromProtocolTable) {
@@ -149,7 +186,7 @@ TEST(ParticleFieldProfileValidator, EnforcesReservedCoreSemanticContractsFromPro
     c.requiredPlanes.back().valueClass = particle::FieldValueClass::Scalar;
     f.validityPlane.key.semanticID = 3;
     f.validityPlane.valueClass = particle::FieldValueClass::Scalar;
-    EXPECT_EQ(validate(c, f), particle::FieldProfileValidationCode::SemanticContractMismatch);
+    EXPECT_EQ(validate(c, f), particle::FieldProfileValidationCode::InvalidFrame);
 }
 
 TEST(ParticleFieldProfileValidator, EnforcesDirectionCircularQuantizationContract) {
@@ -264,6 +301,7 @@ TEST(ParticleFieldRuntime, ForecastClockPreservesHalfMillisecondRemainder) {
 
     ASSERT_TRUE(clock.setRequestedForecastTime(3'000));
     ASSERT_TRUE(clock.setPlaybackSpeed(1.0f));
+    clock.play();
     EXPECT_TRUE(clock.advance(3));
     EXPECT_EQ(clock.requestedForecastTime(), 3'003);
     ASSERT_TRUE(clock.setPlaybackSpeed(2.0f));
diff --git a/粒子开发记录.md b/粒子开发记录.md
index 272bd9c31..bb0017295 100644
--- a/粒子开发记录.md
+++ b/粒子开发记录.md
@@ -704,3 +704,9 @@ Android V3-08 单次综合验收已完成并关闭。Native `13.4.1-particle.2`
 - Generic Validator 新增静态数据表驱动的 Native Core semantic contract：`1/2` 固定 U/V velocity、`3` 固定 shared validity、`10/11` 固定 Direction DEGREE/NONE/group0；Contract 与 Frame 的冲突均结构化拒绝为 `SemanticContractMismatch`，不依赖任何 profile 或产品名称。
 - `DIRECTION_ANGLE` 通用 Circular Quantization 现强制 `DEGREE=4`、NONE、group0、UINT16、offset=0、`scale=360/65536`（极小 float32 tolerance）；opaque unknown Scalar unit 保持可扩展。
 - Linux OpenGL `mbgl-test`、Validator/Runtime 过滤测试和 V3 Field/Timeline 过滤回归均 PASS，`git diff --check` PASS；未执行 Android Gradle/APK/ADB/真机/Jest/iOS-Metal，未进入 QBIN Decoder、Binding/Projection、Renderer、JNI、Android 或 RN。
+
+### 2026-09-13 STEP-073 v4 最终关闭修正
+
+- `DecodedFieldFrame` 固化 single shared validity domain：designated validity 必须为 `Validity/Bitset/NONE/group0/None/REQUIRED`，与 `validityBits` 同一共享引用；普通 `planes[]` 禁止第二张 Validity。空 numeric `planes[]` 仍结构有效，缺 Profile numeric requirement 正确返回 `MissingRequiredPlane`。
+- Validator 在 required descriptor 匹配前检查 actual reserved Core semantic；semantic 1 Scalar 伪装、semantic 10 的 component/group 冲突优先为 `SemanticContractMismatch`。unknown Scalar opaque 与 Direction circular quantization 规则保持。
+- ForecastClock 测试在 pause 后显式恢复 `play()`，生产 pause 语义未改。实际重建并重链 `mbgl-test-runner` 后，V4 filter 11/11 PASS、V3 定向回归 11/11 PASS、`git diff --check` PASS；未进入 Decoder/Renderer/JNI/Android/RN，停止等待独立复验。