diff --git a/package.json b/package.json
index c72353797..5f9d7b7b4 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
     "ci:build": "yarn build:types && yarn build all && yarn build:i18n && yarn build:ts && yarn build:docs && yarn test:imports",
     "test:imports": "node --test test/esm.test.js test/i18n.test.js test/ssr.test.js test/asr-distribution.test.js",
     "typecheck": "node scripts/typecheck.mjs",
-    "test:unit": "node --test test/asr-encoding.test.js test/asr-lifecycle.test.js test/asr-audio.test.js test/asr.test.js test/jassub.test.js test/multiple-subtitles-merge.test.js test/multiple-subtitles-lifecycle.test.js test/multiple-subtitles-failures.test.js test/multiple-subtitles.test.js test/multiple-subtitles-vendor.test.js test/vtt-thumbnail-parser.test.js test/vtt-thumbnail-lifecycle.test.js test/vtt-thumbnail.test.js test/auto-thumbnail-frames.test.js test/auto-thumbnail-lifecycle.test.js test/auto-thumbnail.test.js test/thumbnail-emitter.test.js test/thumbnail-runtime.test.js test/thumbnail-vendor.test.js test/thumbnail-lifecycle.test.js test/thumbnail-input.test.js test/thumbnail.test.js test/iframe-navigation.test.js test/iframe-boundaries.test.js test/iframe-lifecycle.test.js test/iframe.test.js test/mediabunny.test.js test/mediabunny-shim.test.js test/mediabunny-coordination.test.js test/mediabunny-video.test.js test/mediabunny-audio.test.js test/mediabunny-hls.test.js test/mediabunny-entry.test.js test/mediabunny-capability.test.js test/mediabunny-load.test.js test/mediabunny-input.test.js test/dpip.test.js test/dpip-lifecycle.test.js test/canvas.test.js test/canvas-lifecycle.test.js test/ambilight.test.js test/ambilight-lifecycle.test.js test/ambilight-proxy.test.js test/vast.test.js test/vast-lifecycle.test.js test/ads.test.js test/ads-lifecycle.test.js test/playback.test.js test/dash-control.test.js test/dash-contract.test.js test/dash-lifecycle.test.js test/dash-events.test.js test/hls-control.test.js test/audio-track.test.js test/public-behavior.test.js test/helpers.test.js test/chapter.test.js test/utils.test.js test/resource-scope.test.js test/instance-lifecycle.test.js test/options.test.js test/media-hosts.test.js test/plugins.test.js test/source.test.js test/playback-properties.test.js test/media-events.test.js test/template-resources.test.js test/core-vendor.test.js test/component-resources.test.js test/setting-model.test.js test/setting-layout.test.js test/setting-resources.test.js test/subtitle.test.js test/display-native.test.js test/display-video-fullscreen.test.js test/display-pip.test.js test/display-mini.test.js test/display-sizing.test.js test/display-orientation.test.js test/hotkey.test.js test/listener-registry.test.js test/global-events.test.js test/pointer-events.test.js test/gesture.test.js test/event-scheduling.test.js test/notice.test.js test/fast-forward.test.js test/auto-playback.test.js test/builtin-layers.test.js test/prompt-components.test.js test/screenshot.test.js test/thumbnails.test.js test/progress.test.js test/environment.test.js test/storage.test.js test/facade-properties.test.js test/dom-boundaries.test.js test/initialization.test.js test/entry.test.js test/accessibility-button.test.js test/accessibility-focus.test.js test/accessibility-slider.test.js test/asr-fallback-routing.test.js test/asr-local-example.test.js test/asr-explicit-capture.test.js test/chromecast.test.js",
+    "test:unit": "node --test test/asr-encoding.test.js test/asr-lifecycle.test.js test/asr-audio.test.js test/asr.test.js test/jassub.test.js test/multiple-subtitles-merge.test.js test/multiple-subtitles-lifecycle.test.js test/multiple-subtitles-failures.test.js test/multiple-subtitles.test.js test/multiple-subtitles-vendor.test.js test/vtt-thumbnail-parser.test.js test/vtt-thumbnail-lifecycle.test.js test/vtt-thumbnail.test.js test/auto-thumbnail-frames.test.js test/auto-thumbnail-lifecycle.test.js test/auto-thumbnail.test.js test/thumbnail-emitter.test.js test/thumbnail-runtime.test.js test/thumbnail-vendor.test.js test/thumbnail-lifecycle.test.js test/thumbnail-input.test.js test/thumbnail.test.js test/iframe-navigation.test.js test/iframe-boundaries.test.js test/iframe-lifecycle.test.js test/iframe.test.js test/mediabunny.test.js test/mediabunny-shim.test.js test/mediabunny-coordination.test.js test/mediabunny-video.test.js test/mediabunny-audio.test.js test/mediabunny-hls.test.js test/mediabunny-entry.test.js test/mediabunny-capability.test.js test/mediabunny-load.test.js test/mediabunny-input.test.js test/dpip.test.js test/dpip-lifecycle.test.js test/canvas.test.js test/canvas-lifecycle.test.js test/ambilight.test.js test/ambilight-lifecycle.test.js test/ambilight-proxy.test.js test/vast.test.js test/vast-lifecycle.test.js test/ads.test.js test/ads-lifecycle.test.js test/playback.test.js test/dash-control.test.js test/dash-contract.test.js test/dash-lifecycle.test.js test/dash-events.test.js test/hls-control.test.js test/audio-track.test.js test/public-behavior.test.js test/helpers.test.js test/chapter.test.js test/utils.test.js test/resource-scope.test.js test/instance-lifecycle.test.js test/options.test.js test/media-hosts.test.js test/plugins.test.js test/source.test.js test/playback-properties.test.js test/media-events.test.js test/template-resources.test.js test/core-vendor.test.js test/component-resources.test.js test/setting-model.test.js test/setting-layout.test.js test/setting-resources.test.js test/subtitle.test.js test/display-native.test.js test/display-video-fullscreen.test.js test/display-pip.test.js test/display-mini.test.js test/display-sizing.test.js test/display-orientation.test.js test/hotkey.test.js test/listener-registry.test.js test/global-events.test.js test/pointer-events.test.js test/gesture.test.js test/event-scheduling.test.js test/notice.test.js test/fast-forward.test.js test/auto-playback.test.js test/builtin-layers.test.js test/prompt-components.test.js test/screenshot.test.js test/thumbnails.test.js test/progress.test.js test/environment.test.js test/storage.test.js test/facade-properties.test.js test/dom-boundaries.test.js test/initialization.test.js test/entry.test.js test/accessibility-button.test.js test/accessibility-focus.test.js test/accessibility-slider.test.js test/asr-fallback-routing.test.js test/asr-local-example.test.js test/asr-explicit-capture.test.js test/chromecast.test.js test/chromecast-failures.test.js",
     "test:coverage": "node --test test/coverage.test.js && node scripts/coverage.mjs",
     "test": "yarn test:node && yarn test:baseline",
     "test:browser": "playwright test",
@@ -97,7 +97,7 @@
     "test:asr": "node --test test/asr.test.js test/asr-audio.test.js test/asr-encoding.test.js test/asr-lifecycle.test.js test/asr-distribution.test.js test/asr-fallback-routing.test.js test/asr-local-example.test.js test/asr-explicit-capture.test.js",
     "test:asr-types-package": "node refactor/scripts/asr-package-types.mjs",
     "test:asr-demo": "node refactor/scripts/asr-local-demo.mjs",
-    "test:chromecast": "node --test test/chromecast.test.js"
+    "test:chromecast": "node --test test/chromecast.test.js test/chromecast-failures.test.js"
   },
   "browserslist": "last 1 Chrome version",
   "devDependencies": {
diff --git a/refactor/baselines/chromecast-failures-validation.json b/refactor/baselines/chromecast-failures-validation.json
new file mode 100644
index 000000000..1556aaab5
--- /dev/null
+++ b/refactor/baselines/chromecast-failures-validation.json
@@ -0,0 +1,63 @@
+{
+  "schemaVersion": 1,
+  "task": "PKG-CAST-02",
+  "capturedAt": "2026-09-13T08:39:20.323Z",
+  "sourceCommit": "146b78d5767bba88612184869155a39317794537",
+  "tests": {
+    "passed": 93,
+    "public": 28,
+    "additional": 65,
+    "failed": 0,
+    "skipped": 0,
+    "cancelled": 0,
+    "file": "refactor/.cache/chromecast02-tests.log",
+    "sha256": "47c5203986e2dbabd372fe27349d986bde52e77be1cae4462b7c827d73b2a466"
+  },
+  "inputs": {
+    "test/helpers/chromecast.js": "a51ad278dffde582c00d66cd3c0ea868141548d349a80a24a355856378ab5de7",
+    "test/chromecast.test.js": "be9d42e13ea495d7c266732ffe0273acb96d1a29b8ef330eba32156aaa5eccb8",
+    "test/chromecast-failures.test.js": "53660df362e5d55d9bd87ff1a038073ce39982e3307f79ee2c41f91bd8fe4bd2",
+    "refactor/baselines/chromecast-release.json": "a68745786d976afee10afb2bb0fd61aeba8f9fffa18737af3e395d25079e3eec"
+  },
+  "observations": [
+    {
+      "id": "CAST-SDK-01",
+      "title": "Cast requestSession completion is incorrectly passed to loadMedia as a session",
+      "confirmed": "Controlled SDK and real frozen plugin code; not a physical Cast session."
+    },
+    {
+      "id": "CAST-LOADER-01",
+      "title": "Cast readiness waits hang or overwrite each other across ready SDKs, repeated clicks and multiple instances",
+      "confirmed": "Controlled SDK and real frozen plugin code; not a physical Cast session."
+    },
+    {
+      "id": "CAST-LIFE-01",
+      "title": "Cast listeners and continuations survive player destruction and update another player icon",
+      "confirmed": "Controlled SDK and real frozen plugin code; not a physical Cast session."
+    },
+    {
+      "id": "CAST-STATE-01",
+      "title": "Cast terminal session states leave the normalized callback and icon connected",
+      "confirmed": "Controlled SDK and real frozen plugin code; not a physical Cast session."
+    },
+    {
+      "id": "CAST-ERROR-01",
+      "title": "Cast media loading rejection escapes on a detached Promise while the click has already fulfilled",
+      "confirmed": "Controlled SDK and real frozen plugin code; not a physical Cast session."
+    }
+  ],
+  "preserved": [
+    "Latest getter returns raw SessionState, initially null.",
+    "Callbacks receive their original option as this and are looked up live.",
+    "Current art.option.url is used when option.url is absent.",
+    "1.0 eager registration and name-only result are tested separately."
+  ],
+  "sourceReferences": [
+    "https://developers.google.com/cast/docs/reference/web_sender/cast.framework.CastContext",
+    "https://developers.google.com/cast/docs/reference/web_sender/cast.framework.CastSession#loadMedia"
+  ],
+  "sourceChanged": false,
+  "deviceValidated": false,
+  "sdkNetworkLoaded": false,
+  "releaseReady": false
+}
diff --git a/refactor/changes/2026-09-13-PKG-CAST-02-failures.md b/refactor/changes/2026-09-13-PKG-CAST-02-failures.md
new file mode 100644
index 000000000..521efb404
--- /dev/null
+++ b/refactor/changes/2026-09-13-PKG-CAST-02-failures.md
@@ -0,0 +1,31 @@
+# PKG-CAST-02 受控 SDK 与错误基线
+
+新增65项1.1.0及冻结工作区缺陷/边界观察，连同01的28项公共行为共93项通过。
+这些测试验证历史错误确实可复现，不代表候选已修复；所有SDK/DOM均明确受控，
+没有连接真实Cast设备、请求远程SDK或验证实际媒体播放。
+
+## 已复现与下一步修正
+
+| 风险 | 精确复现 | 03的修复方向 |
+| --- | --- | --- |
+| CAST-SDK-01 | requestSession成功返回undefined，旧click把它当session后在loadMedia处TypeError | 请求结算后读取getCurrentSession并处理null和过期归属 |
+| CAST-LOADER-01 | 已就绪Framework仍等待过去的availability；两实例覆盖handler、插两脚本、首click不结算；回调中setOptions异常逃逸 | 共享可重用加载协调、真实ready检测、保留外部handler、单一错误边界 |
+| CAST-LIFE-01 | 无destroy订阅/解绑，销毁后仍回调和加载；第二实例改第一图标；复用工厂共享状态 | 实例范围控制器、控件节点归属、代际取消及独立监听释放，不擅自结束共享会话 |
+| CAST-STATE-01 | SESSION_ENDED更新原始getter但图标/归一化回调仍connected | 完整终态映射，保持getter返回SessionState |
+| CAST-ERROR-01 | loadMedia拒绝另起脱离链，click已fulfilled而末端Promise拒绝 | 返回并await完整加载链，原错误与单次onError、notice有明确归属 |
+
+另验证false availability、用户拒绝会话、脚本失败后重试残留、当前art.option.url、
+live回调替换与this===option。SDK自身返回的Promise链由测试独立观察并附拒绝处理，
+没有修改插件全局Promise或把孤立拒绝伪装成click拒绝。
+
+来源规范：[CastContext](https://developers.google.com/cast/docs/reference/web_sender/cast.framework.CastContext)、
+[CastSession.loadMedia](https://developers.google.com/cast/docs/reference/web_sender/cast.framework.CastSession#loadMedia)、
+[SessionState](https://developers.google.com/cast/docs/reference/web_sender/cast.framework#SessionState)。
+1.0.0的提前SDK加载、仅name结果、已有SDK可立即注册及原始加载拒绝在01中单独冻结；
+不把1.1.0新增的回调/getter测试强行套给1.0.0，也不将它列为skip。
+
+新增失败文件接入test:chromecast及test:unit。精确输入和日志哈希见
+[证据](../baselines/chromecast-failures-validation.json)。生产源码/声明/产物未改，不进行
+无意义重构建。03接着拆分loader/SDK适配/实例会话/UI与清理，并解决VENDOR-10图标
+来源问题；04处理精确类型，05保留真实HTTPS Chrome/接收设备/媒体可达性门槛。
+这些问题按已有任务修复，不仅记录后搁置；本步单独提交，不推送或发布。
diff --git a/refactor/plan.md b/refactor/plan.md
index 8de22fbd0..736032aaf 100644
--- a/refactor/plan.md
+++ b/refactor/plan.md
@@ -4,7 +4,7 @@
 
 基线：`40fcda6a37d0049d42e49c1e64e70d4fd9ba5f7f`。总任务 228 项，范围 22 个包及工作区/示例。
 
-状态：todo 80 / doing 17 / blocked 0 / done 131 / deferred 0。风险 L/M/H 表示兼容风险，不表示工期。
+状态：todo 79 / doing 17 / blocked 0 / done 132 / deferred 0。风险 L/M/H 表示兼容风险，不表示工期。
 
 前置依赖是启动条件；验收是完成条件。任务可以继续拆分，但不能复用或悄悄删除旧 ID。
 
@@ -288,7 +288,7 @@
 | ID | 范围 / 步骤 | 前置依赖 | 交付物 | 验收条件 | 风险 | 状态 |
 | --- | --- | --- | --- | --- | --- | --- |
 | PKG-CAST-01 | artplayer-plugin-chromecast<br>核对包契约与历史用法 | BASE-05 | url/sdk/icon/mimeType、loader、会话、全局 SDK 与结果 | 源码/声明/README/demo/发布包差异已登记；公开形状和版本范围冻结 | H | done |
-| PKG-CAST-02 | artplayer-plugin-chromecast<br>建立特有行为与错误测试 | PKG-CAST-01, ENG-03, ENG-05 | SDK 脚本加载失败/重入、无设备/拒绝、重复实例与销毁 | 旧版本行为可重跑，成功/失败/切源/销毁有必要断言 | H | todo |
+| PKG-CAST-02 | artplayer-plugin-chromecast<br>建立特有行为与错误测试 | PKG-CAST-01, ENG-03, ENG-05 | SDK 脚本加载失败/重入、无设备/拒绝、重复实例与销毁 | 旧版本行为可重跑，成功/失败/切源/销毁有必要断言 | H | done |
 | PKG-CAST-03 | artplayer-plugin-chromecast<br>整理内部职责与资源 | PKG-CAST-02, CORE-11, CORE-13 | SDK singleton/实例订阅/会话与控件职责分离 | 结构变化和缺陷修复分开记录；原 API/事件/资源生命周期通过 | H | todo |
 | PKG-CAST-04 | artplayer-plugin-chromecast<br>迁移自有源码和公开类型 | PKG-CAST-03, ENG-04, ENG-06, CORE-07 | Cast 能力 adapter、全局对象和元数据类型 | 严格类型检查、旧消费样例通过；声明路径/导出和同步异步兼容 | H | todo |
 | PKG-CAST-05 | artplayer-plugin-chromecast<br>验证新旧核心和组合 | PKG-CAST-04, CORE-22 | stub 测试之外记录实际 Cast 设备会话、源更新和断开 | 最终核心与原支持范围核心分别通过；设备/SDK 缺证据不能标完成 | H | todo |
@@ -543,6 +543,7 @@
 - PKG-VAST-02: [记录](changes/2026-09-12-PKG-VAST-02-tests.md) [记录](baselines/vast-behavior-validation.json) [记录](baselines/vast-core.json) [记录](vast-validation.md)
 - PKG-VAST-03: [记录](changes/2026-09-12-PKG-VAST-03-lifecycle.md) [记录](baselines/vast-lifecycle-validation.json) [记录](vast-compatibility-decision.md)
 - PKG-CAST-01: [记录](baselines/chromecast-release.json) [记录](baselines/chromecast-contract.md) [记录](baselines/chromecast-contract-validation.json) [记录](changes/2026-09-13-PKG-CAST-01-contracts.md)
+- PKG-CAST-02: [记录](changes/2026-09-13-PKG-CAST-02-failures.md) [记录](baselines/chromecast-failures-validation.json)
 - PKG-DPIP-01: [记录](changes/2026-09-12-PKG-DPIP-01-contract.md) [记录](baselines/dpip-release.json) [记录](baselines/dpip-contract.md) [记录](baselines/dpip-contract-validation.json) [记录](dpip-validation.md)
 - PKG-DPIP-02: [记录](changes/2026-09-12-PKG-DPIP-02-tests.md) [记录](baselines/dpip-behavior-validation.json) [记录](dpip-validation.md)
 - PKG-DPIP-03: [记录](changes/2026-09-12-PKG-DPIP-03-lifecycle.md) [记录](baselines/dpip-lifecycle-validation.json) [记录](dpip-validation.md)
diff --git a/refactor/progress.md b/refactor/progress.md
index a5ebb3044..0b155b0e5 100644
--- a/refactor/progress.md
+++ b/refactor/progress.md
@@ -1,5 +1,16 @@
 # 进度与证据
 
+## PKG-CAST-02 Chromecast 错误基线完成
+
+93项受控历史测试通过，其中65项新增错误/生命周期观察。首次会话结果误用、已就绪
+SDK悬空/多实例覆盖、错图标与销毁后加载、终态遗漏、脱离媒体Promise均已复现并
+登记03修复任务。live选项/回调this/原始SessionState继续保留。见[变更](changes/2026-09-13-PKG-CAST-02-failures.md)
+与[证据](baselines/chromecast-failures-validation.json)。生产仍未改，真实Cast设备与
+远程SDK尚未验证。228项：132 done、17 doing、79 todo；217风险。
+下一步03生产模块与资源修复；已获授权的Canvas/Ambilight类型修复正由两个子代理
+独立实施，父代理协调共享类型检查和编辑器生成。没有推送或发布。
+
+
 ## PKG-CAST-01 Chromecast 契约与来源完成
 
 冻结真实npm1.0.0/1.1.0与9个工作区输入，逐成员、入口及git关联核验通过。1.0.0
diff --git a/refactor/risk-table.md b/refactor/risk-table.md
index de8033267..a4f68a477 100644
--- a/refactor/risk-table.md
+++ b/refactor/risk-table.md
@@ -216,3 +216,8 @@
 | ASR-RESTART-01 | resolved / 已复现 | Delayed captured-source restart resumes recognition after a newer pause or stop | PKG-ASR-09 |
 | VENDOR-10 | open / 源码/产物事实 | Chromecast embeds a Font Awesome Pro path with no established redistribution entitlement | PKG-CAST-03, PKG-CAST-06 |
 | CAST-TYPE-01 | open / 源码/产物事实 | Chromecast declarations describe a synchronous name-only registration and omit existing runtime callbacks and query methods | PKG-CAST-04 |
+| CAST-SDK-01 | open / 已复现 | Cast requestSession completion is incorrectly passed to loadMedia as a session | PKG-CAST-03, PKG-CAST-05 |
+| CAST-LOADER-01 | open / 已复现 | Cast readiness waits hang or overwrite each other across ready SDKs, repeated clicks and multiple instances | PKG-CAST-03, PKG-CAST-05 |
+| CAST-LIFE-01 | open / 已复现 | Cast listeners and continuations survive player destruction and update another player icon | PKG-CAST-03, PKG-CAST-05 |
+| CAST-STATE-01 | open / 已复现 | Cast terminal session states leave the normalized callback and icon connected | PKG-CAST-03, PKG-CAST-05 |
+| CAST-ERROR-01 | open / 已复现 | Cast media loading rejection escapes on a detached Promise while the click has already fulfilled | PKG-CAST-03, PKG-CAST-05 |
diff --git a/refactor/risks.json b/refactor/risks.json
index 4ae5af378..6fa773082 100644
--- a/refactor/risks.json
+++ b/refactor/risks.json
@@ -4745,6 +4745,86 @@
       ],
       "compatibleResolution": "Preserve the latest published root factory type and provide a precise runtime type view; verify valid historical JavaScript module forms independently.",
       "closureCriteria": "Frozen type consumers and replacements pass, accurate async/callback/state declarations work through an additive entry, and actual installed exports are tested."
+    },
+    {
+      "id": "CAST-SDK-01",
+      "title": "Cast requestSession completion is incorrectly passed to loadMedia as a session",
+      "confirmation": "reproduced",
+      "status": "open",
+      "owners": [
+        "PKG-CAST-03",
+        "PKG-CAST-05"
+      ],
+      "evidence": [
+        "test/chromecast-failures.test.js",
+        "refactor/baselines/chromecast-failures-validation.json"
+      ],
+      "compatibleResolution": "Retrieve the actual current session after request success and validate live instance ownership.",
+      "closureCriteria": "Successful undefined/null request result loads through the current session; absence and refusal preserve appropriate original errors."
+    },
+    {
+      "id": "CAST-LOADER-01",
+      "title": "Cast readiness waits hang or overwrite each other across ready SDKs, repeated clicks and multiple instances",
+      "confirmation": "reproduced",
+      "status": "open",
+      "owners": [
+        "PKG-CAST-03",
+        "PKG-CAST-05"
+      ],
+      "evidence": [
+        "test/chromecast-failures.test.js",
+        "refactor/baselines/chromecast-failures-validation.json"
+      ],
+      "compatibleResolution": "Coordinate one reusable loader per document with readiness detection, shared pending work and complete error settlement.",
+      "closureCriteria": "Ready, pending, failure, retry, external callback and multiple instances are covered without duplicate scripts or stranded callers."
+    },
+    {
+      "id": "CAST-LIFE-01",
+      "title": "Cast listeners and continuations survive player destruction and update another player icon",
+      "confirmation": "reproduced",
+      "status": "open",
+      "owners": [
+        "PKG-CAST-03",
+        "PKG-CAST-05"
+      ],
+      "evidence": [
+        "test/chromecast-failures.test.js",
+        "refactor/baselines/chromecast-failures-validation.json"
+      ],
+      "compatibleResolution": "Use per-registration lifecycle ownership, scoped control nodes and obsolete-operation checks without ending a page-shared session.",
+      "closureCriteria": "Destroyed players get no late media loads or callbacks; subscriptions are removed and separate players keep independent UI."
+    },
+    {
+      "id": "CAST-STATE-01",
+      "title": "Cast terminal session states leave the normalized callback and icon connected",
+      "confirmation": "reproduced",
+      "status": "open",
+      "owners": [
+        "PKG-CAST-03",
+        "PKG-CAST-05"
+      ],
+      "evidence": [
+        "test/chromecast-failures.test.js",
+        "refactor/baselines/chromecast-failures-validation.json"
+      ],
+      "compatibleResolution": "Map terminal states without changing the raw SessionState query API.",
+      "closureCriteria": "Ended and failed states update UI and callbacks while getCastState keeps original SessionState values."
+    },
+    {
+      "id": "CAST-ERROR-01",
+      "title": "Cast media loading rejection escapes on a detached Promise while the click has already fulfilled",
+      "confirmation": "reproduced",
+      "status": "open",
+      "owners": [
+        "PKG-CAST-03",
+        "PKG-CAST-05"
+      ],
+      "evidence": [
+        "test/chromecast-failures.test.js",
+        "refactor/baselines/chromecast-failures-validation.json"
+      ],
+      "compatibleResolution": "Await the complete media-loading chain and preserve one original error notification.",
+      "closureCriteria": "loadMedia failure reaches the click promise exactly once, no orphan rejection or duplicated error callback; success ordering remains documented."
     }
   ]
 }
diff --git a/refactor/tasks.json b/refactor/tasks.json
index e7af2ab7f..c4f09c051 100644
--- a/refactor/tasks.json
+++ b/refactor/tasks.json
@@ -3015,11 +3015,14 @@
         "ENG-03",
         "ENG-05"
       ],
-      "status": "todo",
+      "status": "done",
       "risk": "H",
       "deliverable": "SDK 脚本加载失败/重入、无设备/拒绝、重复实例与销毁",
       "acceptance": "旧版本行为可重跑，成功/失败/切源/销毁有必要断言",
-      "evidence": []
+      "evidence": [
+        "changes/2026-09-13-PKG-CAST-02-failures.md",
+        "baselines/chromecast-failures-validation.json"
+      ]
     },
     {
       "id": "PKG-CAST-03",
diff --git a/test/chromecast-failures.test.js b/test/chromecast-failures.test.js
new file mode 100644
index 000000000..8b2c5ec59
--- /dev/null
+++ b/test/chromecast-failures.test.js
@@ -0,0 +1,250 @@
+import assert from 'node:assert/strict'
+// eslint-disable-next-line test/no-import-node-test -- Historical Chromecast defects remain explicit observations.
+import test from 'node:test'
+import { chromecastEnvironment, chromecastHistorical } from './helpers/chromecast.js'
+
+for (const implementation of await chromecastHistorical()) {
+  // Version 1.0 loads during registration and has no query/callback surface.
+  // Its distinct public behavior is frozen in chromecast.test.js.
+  if (implementation.name.startsWith('published-1.0.0-'))
+    continue
+  test(`Chromecast ${implementation.name}: available Framework still waits for an availability callback that already happened`, async () => {
+    const env = chromecastEnvironment(implementation)
+    env.installSdk()
+    const player = env.player()
+    await env.factory({})(player.art)
+    let settled = false
+    player.controls[0].click().then(() => {
+      settled = true
+    }, () => {
+      settled = true
+    })
+    await env.flush()
+    assert.equal(settled, false)
+    assert.equal(env.scripts.length, 0)
+    assert.equal(env.sdkOptions.length, 0)
+    assert.equal(typeof env.context.__onGCastApiAvailable, 'function')
+  })
+
+  test(`Chromecast ${implementation.name}: successful requestSession completion is incorrectly used as a session`, async () => {
+    const env = chromecastEnvironment(implementation)
+    const player = env.player()
+    const errors = []
+    await env.factory({ onError: error => errors.push(error) })(player.art)
+    const pending = player.controls[0].click()
+    env.installSdk({ requestResult: undefined })
+    env.context.__onGCastApiAvailable(true)
+    await assert.rejects(pending, error => error.name === 'TypeError' && error.message.includes('loadMedia'))
+    assert.equal(env.requests(), 1)
+    assert.equal(env.mediaLoads.length, 0)
+    assert.equal(errors.length, 1)
+    assert.equal(player.art.notice.show, 'Error connecting to cast session')
+  })
+
+  test(`Chromecast ${implementation.name}: concurrent instances overwrite availability and strand the first click`, async () => {
+    const env = chromecastEnvironment(implementation)
+    const first = env.player()
+    const second = env.player()
+    await env.factory({})(first.art)
+    await env.factory({})(second.art)
+    let firstSettled = false
+    first.controls[0].click().then(() => {
+      firstSettled = true
+    }, () => {
+      firstSettled = true
+    })
+    const firstHandler = env.context.__onGCastApiAvailable
+    const next = second.controls[0].click()
+    assert.notEqual(env.context.__onGCastApiAvailable, firstHandler)
+    assert.equal(env.scripts.length, 2)
+    env.installSdk()
+    env.context.__onGCastApiAvailable(true)
+    env.sessionState('SESSION_STARTED')
+    await next
+    await env.flush()
+    assert.equal(firstSettled, false)
+    assert.equal(first.icon.style.color, 'red', 'Second instance modifies the first global icon')
+    assert.equal(second.icon.style.color, undefined)
+  })
+
+  test(`Chromecast ${implementation.name}: reusing one factory shares session state across players`, async () => {
+    const env = chromecastEnvironment(implementation)
+    const first = env.player()
+    const second = env.player()
+    const register = env.factory({})
+    const a = await register(first.art)
+    const b = await register(second.art)
+    const pending = second.controls[0].click()
+    env.installSdk()
+    env.context.__onGCastApiAvailable(true)
+    env.sessionState('SESSION_STARTED')
+    await pending
+    assert.equal(a.getCastState(), 'SESSION_STARTED')
+    assert.equal(a.isCasting(), true)
+    assert.equal(b.isCasting(), true)
+    assert.equal(first.icon.style.color, 'red')
+    assert.equal(second.icon.style.color, undefined)
+  })
+
+  test(`Chromecast ${implementation.name}: ended state changes the raw getter but leaves callback and icon connected`, async () => {
+    const env = chromecastEnvironment(implementation)
+    const player = env.player()
+    const states = []
+    const plugin = await env.factory({ onStateChange: value => states.push(value) })(player.art)
+    const pending = player.controls[0].click()
+    env.installSdk()
+    env.context.__onGCastApiAvailable(true)
+    env.sessionState('SESSION_STARTED')
+    await pending
+    env.sessionState('SESSION_ENDED', null)
+    assert.equal(plugin.getCastState(), 'SESSION_ENDED')
+    assert.equal(plugin.isCasting(), false)
+    assert.deepEqual(states, ['connected'])
+    assert.equal(player.icon.style.color, 'red')
+  })
+
+  test(`Chromecast ${implementation.name}: media rejection is detached from the fulfilled click promise`, async () => {
+    const env = chromecastEnvironment(implementation)
+    const player = env.player()
+    const error = new Error('receiver rejected media')
+    const errors = []
+    await env.factory({ onError: value => errors.push(value) })(player.art)
+    const pending = player.controls[0].click()
+    env.installSdk({ loadError: error })
+    env.context.__onGCastApiAvailable(true)
+    env.sessionState('SESSION_STARTED')
+    assert.equal(await pending, undefined)
+    await env.flush()
+    await assert.rejects(env.pendingMedia.at(-1), value => value === error)
+    assert.deepEqual(errors, [error])
+    assert.equal(player.art.notice.show, 'Error casting media')
+  })
+
+  test(`Chromecast ${implementation.name}: destroy leaves SDK listeners and callbacks active`, async () => {
+    const env = chromecastEnvironment(implementation)
+    const player = env.player()
+    const availability = []
+    await env.factory({ onCastAvailable: value => availability.push(value) })(player.art)
+    const pending = player.controls[0].click()
+    env.installSdk()
+    env.context.__onGCastApiAvailable(true)
+    env.sessionState('SESSION_STARTED')
+    await pending
+    player.destroy()
+    env.emit('caststatechanged', { castState: 'NO_DEVICES_AVAILABLE' })
+    assert.deepEqual(availability, [false])
+    assert.equal(player.listeners.size, 0)
+    assert.equal(env.sdkListeners.get('sessionstatechanged').length, 1)
+    assert.equal(env.sdkListeners.get('caststatechanged').length, 1)
+  })
+
+  test(`Chromecast ${implementation.name}: exception inside availability escapes without settling initialization`, async () => {
+    const env = chromecastEnvironment(implementation)
+    const player = env.player()
+    await env.factory({})(player.art)
+    let settled = false
+    player.controls[0].click().then(() => {
+      settled = true
+    }, () => {
+      settled = true
+    })
+    const error = new Error('CastOptions failed')
+    const { castContext } = env.installSdk()
+    castContext.setOptions = () => {
+      throw error
+    }
+    assert.throws(() => env.context.__onGCastApiAvailable(true), value => value === error)
+    await env.flush()
+    assert.equal(settled, false)
+  })
+
+  test(`Chromecast ${implementation.name}: unavailable API rejects with one original callback error`, async () => {
+    const env = chromecastEnvironment(implementation)
+    const player = env.player()
+    const errors = []
+    const option = { onError(error) {
+      errors.push({ error, receiver: this })
+    } }
+    await env.factory(option)(player.art)
+    const pending = player.controls[0].click()
+    env.context.__onGCastApiAvailable(false)
+    await assert.rejects(pending, error => error.message === 'Cast API is not available' && error === errors[0].error)
+    assert.equal(errors.length, 1)
+    assert.equal(errors[0].receiver, option)
+    assert.equal(env.scripts.length, 1, 'The failed loader retains its script')
+  })
+
+  test(`Chromecast ${implementation.name}: session request rejection preserves original error and notice`, async () => {
+    const env = chromecastEnvironment(implementation)
+    const player = env.player()
+    const error = new Error('User declined the session')
+    const errors = []
+    await env.factory({ onError: value => errors.push(value) })(player.art)
+    const pending = player.controls[0].click()
+    env.installSdk({ requestError: error })
+    env.context.__onGCastApiAvailable(true)
+    await assert.rejects(pending, value => value === error)
+    assert.deepEqual(errors, [error])
+    assert.equal(env.requests(), 1)
+    assert.equal(env.mediaLoads.length, 0)
+    assert.equal(player.art.notice.show, 'Error connecting to cast session')
+  })
+
+  test(`Chromecast ${implementation.name}: current player source and live callback receiver are used on subsequent casting`, async () => {
+    const env = chromecastEnvironment(implementation)
+    const player = env.player('/first.mp4')
+    const calls = []
+    const option = { onCastStart() {
+      calls.push(this)
+    } }
+    await env.factory(option)(player.art)
+    const pending = player.controls[0].click()
+    env.installSdk()
+    env.context.__onGCastApiAvailable(true)
+    env.sessionState('SESSION_STARTED')
+    await pending
+    await env.flush()
+    player.art.option.url = '/next.webm'
+    option.onCastStart = function () {
+      calls.push(['replacement', this])
+    }
+    await player.controls[0].click()
+    await env.flush()
+    assert.equal(env.mediaLoads.at(-1).media.contentId, '/next.webm')
+    assert.equal(env.mediaLoads.at(-1).media.contentType, 'video/webm')
+    assert.equal(calls[0], option)
+    assert.equal(calls[1][0], 'replacement')
+    assert.equal(calls[1][1], option)
+  })
+
+  test(`Chromecast ${implementation.name}: failed script retry retains old script and replaces the global callback`, async () => {
+    const env = chromecastEnvironment(implementation)
+    const player = env.player()
+    await env.factory({})(player.art)
+    const first = player.controls[0].click()
+    const previous = env.context.__onGCastApiAvailable
+    const error = new Error('script failed')
+    env.scripts[0].onerror(error)
+    await assert.rejects(first, value => value === error)
+    const second = player.controls[0].click()
+    assert.equal(env.scripts.length, 2)
+    assert.notEqual(env.context.__onGCastApiAvailable, previous)
+    env.scripts[1].onerror(error)
+    await assert.rejects(second, value => value === error)
+  })
+
+  test(`Chromecast ${implementation.name}: late SDK availability after destroy still loads media`, async () => {
+    const env = chromecastEnvironment(implementation)
+    const player = env.player()
+    await env.factory({})(player.art)
+    const pending = player.controls[0].click()
+    player.destroy()
+    env.installSdk()
+    env.context.__onGCastApiAvailable(true)
+    env.sessionState('SESSION_STARTED')
+    await pending
+    await env.flush()
+    assert.equal(env.mediaLoads.length, 1)
+    assert.equal(player.art.notice.show, 'Casting started')
+  })
+}