diff --git a/.github/workflows/architecture-observe.yml b/.github/workflows/architecture-observe.yml
new file mode 100644
index 000000000..3af3b9a22
--- /dev/null
+++ b/.github/workflows/architecture-observe.yml
@@ -0,0 +1,69 @@
+name: Official Plugin Architecture Observation
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '17 3 * * 1'
+
+permissions:
+  contents: read
+
+concurrency:
+  group: official-plugin-architecture-observation
+  cancel-in-progress: true
+
+jobs:
+  observe:
+    runs-on: ubuntu-latest
+    name: Compare latest official plugin contracts
+    timeout-minutes: 15
+
+    steps:
+      - name: Checkout MoviePilot
+        uses: actions/checkout@v5
+        with:
+          path: MoviePilot
+
+      - name: Checkout MoviePilot-Plugins
+        uses: actions/checkout@v5
+        with:
+          repository: jxxghp/MoviePilot-Plugins
+          ref: main
+          path: MoviePilot-Plugins
+
+      - name: Set up uv
+        uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
+        with:
+          version: '0.12.5'
+          python-version: '3.12'
+          enable-cache: true
+          cache-dependency-glob: |
+            MoviePilot/pyproject.toml
+            MoviePilot/uv.lock
+
+      - name: Install dependencies
+        working-directory: MoviePilot
+        run: uv sync --locked
+
+      - name: Compare plugin contracts without updating fixtures
+        id: compare
+        continue-on-error: true
+        working-directory: MoviePilot
+        run: |
+          uv run --locked --no-sync python scripts/architecture/baseline.py \
+            --check-plugins \
+            --plugin-repo ../MoviePilot-Plugins \
+            --report official-plugin-architecture-report.json
+
+      - name: Upload semantic comparison report
+        if: always()
+        uses: actions/upload-artifact@v6
+        with:
+          name: official-plugin-architecture-report
+          path: MoviePilot/official-plugin-architecture-report.json
+          if-no-files-found: warn
+          retention-days: 14
+
+      - name: Fail when plugin contracts changed
+        if: steps.compare.outcome == 'failure'
+        run: exit 1
diff --git a/.github/workflows/pylint.yml b/.github/workflows/pylint.yml
index 60767f06b..6e9077e55 100644
--- a/.github/workflows/pylint.yml
+++ b/.github/workflows/pylint.yml
@@ -1,12 +1,21 @@
 name: Pylint Code Quality Check
 
 on:
-  # 允许手动触发
+  pull_request:
+    branches:
+      - v3
+  push:
+    branches:
+      - v3
   workflow_dispatch:
 
 permissions:
   contents: read
 
+concurrency:
+  group: pylint-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   pylint:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0defec821..8194e3764 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -19,6 +19,37 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  architecture:
+    runs-on: ubuntu-latest
+    name: Architecture Contract Gate
+    timeout-minutes: 10
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Set up uv
+        uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d # v10.0.1
+        with:
+          version: '0.12.5'
+          python-version: '3.12'
+          enable-cache: true
+          cache-dependency-glob: |
+            pyproject.toml
+            uv.lock
+
+      - name: Install dependencies
+        run: uv sync --locked
+
+      - name: Check host architecture contracts
+        run: |
+          uv run --locked --no-sync pytest \
+            tests/test_architecture_dependencies.py \
+            tests/test_architecture_contract_baseline.py \
+            tests/test_architecture_baseline_cli.py -q
+          uv run --locked --no-sync python \
+            scripts/architecture/baseline.py --check-host
+
   pytest:
     runs-on: ubuntu-latest
     name: Unit Tests (${{ matrix.shard }})
diff --git a/docs/development-setup.md b/docs/development-setup.md
index ed2842f12..0800b7b66 100644
--- a/docs/development-setup.md
+++ b/docs/development-setup.md
@@ -181,6 +181,20 @@ Safety 直接识别项目清单和锁文件，不需要生成或维护 requireme
    参数启动对应分片。需要单进程调试时使用 `python tests/run.py --serial`。覆盖率报告
    按需通过 `Unit Tests` workflow 的手动触发串行生成，不阻塞常规 PR / push 门禁。
 
+4. **运行架构与静态门禁**：主仓架构检查不依赖独立插件仓；官方插件兼容观察单独运行，
+   任何检查命令都不会写入 fixture。
+
+   ```bash
+   uv run --locked --no-sync python scripts/architecture/baseline.py --check-host
+   uv run --locked --no-sync python scripts/architecture/baseline.py \
+     --check-plugins --plugin-repo ../MoviePilot-Plugins \
+     --report official-plugin-architecture-report.json
+   uv run --locked --no-sync pylint app/
+   ```
+
+   GitHub Actions 会在 `v3` 的 PR/push 中独立执行宿主架构与 Pylint 门禁；最新官方插件仓
+   通过每周或手工观察工作流检查，只上传语义差异报告，不会自动更新已提交基线。
+
 ### 7. 参考资源
 
 - [uv 官方文档](https://docs.astral.sh/uv/)
diff --git a/docs/refactor/backend-architecture-next-stage.md b/docs/refactor/backend-architecture-next-stage.md
index e703a41e3..3a1fda9fb 100644
--- a/docs/refactor/backend-architecture-next-stage.md
+++ b/docs/refactor/backend-architecture-next-stage.md
@@ -6,6 +6,7 @@
 > 审计范围：宿主后端；排除 `app/plugins/**` 运行时插件副本
 > 规范优先级：`AGENTS.md` 与 `docs/rules/` 高于本文
 > 相关文档：`docs/architecture-overview.md`、`docs/refactor/backend-architecture-governance.md`、`docs/refactor/backend-module-refactor-compatibility.md`
+> 实施进度：阶段 0（ARCH-201～203）已完成，后续阶段按任务 ID 独立提交和回滚
 
 ## 1. 结论先行
 
@@ -106,6 +107,10 @@ MoviePilot V3 当前不是“目录混乱、必须推倒重来”的状态。第
 
 **本次审计没有更新任何基线文件。**上述意外写入已恢复，最终工作树只包含本文和文档索引改动。
 
+阶段 0 实施后，宿主与插件基线已使用独立 check/write 入口；运行契约行号只进入按需诊断，
+插件 commit、源码摘要和文件数只作为 provenance。当前宿主和官方插件语义检查均通过，CI 会在
+主仓 PR/push 执行宿主硬门禁，并在定时/手工工作流中上传最新插件仓的语义差异报告。
+
 ## 3. 优秀 Python 后端实践对标
 
 本节只采用与 MoviePilot 当前形态相近、能转化为具体约束的实践。参考不是为了照抄目录，而是为了验证职责、生命周期和失败语义。
diff --git a/docs/testing.md b/docs/testing.md
index 78bb5bbd4..77dcb3ab2 100644
--- a/docs/testing.md
+++ b/docs/testing.md
@@ -145,7 +145,9 @@ def test_recognize_prefers_explicit_identity(sample_meta, monkeypatch):
 
 ## CI 与 PR
 
-- **门禁**：`.github/workflows/test.yml` 在指向 `v3` 的 `pull_request` / `push` 及手动触发时，从 `uv.lock` 同步环境，通过 `tests/run.py --shard N/TOTAL` 把全量测试文件稳定分到 4 个独立 pytest job。每个分片都有独立进程和临时 `CONFIG_DIR`，不共用 SQLite 或进程级状态。
+- **门禁**：`.github/workflows/test.yml` 在指向 `v3` 的 `pull_request` / `push` 及手动触发时，从 `uv.lock` 同步环境。独立 `architecture` job 先运行宿主依赖、运行契约和基线 CLI 快速门禁；全量测试再通过 `tests/run.py --shard N/TOTAL` 稳定分到 4 个 pytest job。每个分片都有独立进程和临时 `CONFIG_DIR`，不共用 SQLite 或进程级状态。
+- **跨仓观察**：`.github/workflows/architecture-observe.yml` 每周或手工检出官方插件仓最新 `main`，使用 `--check-plugins` 比较公开导入、Hook 和动态 API 契约。它只上传 `official-plugin-architecture-report.json`，不会自动刷新 fixture；语义变化必须人工审查后显式执行 `--write-plugins`。
+- **静态检查**：`.github/workflows/pylint.yml` 对指向 `v3` 的 PR、推送和手工触发运行现有严重错误门禁，不再仅依赖维护者手工执行。
 - **PR**：产品代码、测试基础设施、依赖或运行行为发生变化时，运行 `uv run --locked --no-sync python tests/run.py`，默认以 4 个独立 pytest 进程完成全量；需要断点、输出顺序或测试污染诊断时使用 `--serial`。确认本次改动涉及的路径通过且 socket 探针零真实出站。若存在无关失败，必须在当前 `upstream/v3` 基线上独立复现并在 PR 中如实说明；不得静默扩大当前 PR 去修复基线问题。纯文档变更按实际内容执行文本、结构和 diff 检查，CI 仍会运行全量门禁。
 - 覆盖率不参与常规 PR / push 的合并门禁；需要覆盖率制品时手动触发 `Unit Tests` workflow，独立的 `Coverage Report` job 会通过 `tests/run.py --serial` 跑串行全量并上传 JSON / XML 报告。
 - 复现 CI 使用 `uv sync --locked`；主程序运行依赖位于 `[project].dependencies`，pytest 与覆盖率工具位于默认 `dev` 依赖组。
diff --git a/scripts/architecture/baseline.py b/scripts/architecture/baseline.py
index 53471c17f..35acb5746 100644
--- a/scripts/architecture/baseline.py
+++ b/scripts/architecture/baseline.py
@@ -862,6 +862,72 @@ def semantic_baseline(path: Path, value: dict[str, Any]) -> dict[str, Any]:
     return value
 
 
+def _compare_semantic_values(
+    expected: Any,
+    actual: Any,
+    path: str,
+    report: dict[str, list[dict[str, Any]]],
+) -> None:
+    """递归比较语义 JSON，把增删改记录为可审查条目。"""
+    if isinstance(expected, dict) and isinstance(actual, dict):
+        expected_keys = set(expected)
+        actual_keys = set(actual)
+        for key in sorted(expected_keys - actual_keys):
+            report["removed"].append(
+                {"path": f"{path}.{key}", "value": expected[key]}
+            )
+        for key in sorted(actual_keys - expected_keys):
+            report["added"].append(
+                {"path": f"{path}.{key}", "value": actual[key]}
+            )
+        for key in sorted(expected_keys & actual_keys):
+            _compare_semantic_values(
+                expected[key],
+                actual[key],
+                f"{path}.{key}",
+                report,
+            )
+        return
+    if isinstance(expected, list) and isinstance(actual, list):
+        expected_items = {
+            json.dumps(item, ensure_ascii=False, sort_keys=True): item
+            for item in expected
+        }
+        actual_items = {
+            json.dumps(item, ensure_ascii=False, sort_keys=True): item
+            for item in actual
+        }
+        for key in sorted(expected_items.keys() - actual_items.keys()):
+            report["removed"].append({"path": path, "value": expected_items[key]})
+        for key in sorted(actual_items.keys() - expected_items.keys()):
+            report["added"].append({"path": path, "value": actual_items[key]})
+        return
+    if expected != actual:
+        report["changed"].append(
+            {"path": path, "expected": expected, "actual": actual}
+        )
+
+
+def build_comparison_report(path: Path, actual: dict[str, Any]) -> dict[str, Any]:
+    """生成包含语义增删改和 provenance 的机器可读审查报告。"""
+    expected = json.loads(path.read_text(encoding="utf-8"))
+    expected_semantic = semantic_baseline(path, expected)
+    actual_semantic = semantic_baseline(path, actual)
+    differences: dict[str, list[dict[str, Any]]] = {
+        "added": [],
+        "removed": [],
+        "changed": [],
+    }
+    _compare_semantic_values(expected_semantic, actual_semantic, "$", differences)
+    return {
+        "baseline": str(_display_path(path)),
+        "semantic_match": expected_semantic == actual_semantic,
+        "expected_provenance": expected.get("provenance"),
+        "actual_provenance": actual.get("provenance"),
+        **differences,
+    }
+
+
 def check_json(
     path: Path,
     actual: dict[str, Any],
@@ -912,6 +978,11 @@ def parse_args(argv: Optional[list[str]] = None) -> argparse.Namespace:
         action="store_true",
         help="随宿主检查打印当前运行契约源码位置",
     )
+    parser.add_argument(
+        "--report",
+        type=Path,
+        help="将检查结果写为独立 JSON 报告，不修改任何 fixture",
+    )
     args = parser.parse_args(argv)
     if args.check or args.write:
         if not args.scope:
@@ -932,6 +1003,8 @@ def parse_args(argv: Optional[list[str]] = None) -> argparse.Namespace:
         parser.error("--plugin-repo 只能用于插件基线操作")
     if args.diagnostics and not args.check_host:
         parser.error("--diagnostics 只能与 --check-host 一起使用")
+    if args.report and not (args.check_host or args.check_plugins):
+        parser.error("--report 只能与检查操作一起使用")
     return args
 
 
@@ -966,6 +1039,18 @@ def main(argv: Optional[list[str]] = None) -> int:
         check_json(path, baseline, write_hint=write_hint)
         for path, baseline in baselines
     ]
+    if args.report:
+        report_path = args.report.resolve()
+        report_value = {
+            "schema_version": 1,
+            "checks": [
+                build_comparison_report(path, baseline)
+                for path, baseline in baselines
+            ],
+        }
+        print(f"即将写入报告：{_display_path(report_path)}")
+        write_json(report_path, report_value)
+        print(f"已写入报告：{_display_path(report_path)}")
     if args.diagnostics:
         print(json.dumps(collect_runtime_diagnostics(), ensure_ascii=False, indent=2))
     return 0 if all(checks) else 1
diff --git a/tests/test_architecture_baseline_cli.py b/tests/test_architecture_baseline_cli.py
index e6741e462..af50e5b40 100644
--- a/tests/test_architecture_baseline_cli.py
+++ b/tests/test_architecture_baseline_cli.py
@@ -80,6 +80,17 @@ def test_architecture_diagnostics_only_support_host_check(capsys):
     assert "只能与 --check-host" in capsys.readouterr().err
 
 
+def test_architecture_report_only_supports_check_operations(capsys, tmp_path: Path):
+    """审查报告不能与 fixture 写操作混用。"""
+    with pytest.raises(SystemExit) as error:
+        architecture_baseline.parse_args(
+            ["--write-host", "--report", str(tmp_path / "report.json")]
+        )
+
+    assert error.value.code == 2
+    assert "只能与检查操作" in capsys.readouterr().err
+
+
 def test_runtime_semantics_ignore_line_changes_but_keep_call_count(tmp_path: Path):
     """旧 fixture 的行号变化不影响门禁，重复调用次数仍属于语义。"""
     baseline_path = tmp_path / "runtime-contract-baseline.json"
@@ -272,6 +283,66 @@ def test_architecture_write_plugins_only_updates_plugin_file(
     assert not runtime_path.exists()
 
 
+def test_architecture_plugin_check_writes_review_report_only_when_requested(
+    tmp_path: Path,
+    monkeypatch,
+):
+    """跨仓检查失败时应产出语义差异报告，并保持 fixture 不变。"""
+    plugin_repo = tmp_path / "MoviePilot-Plugins"
+    plugin_repo.mkdir()
+    baseline_path = tmp_path / "official-plugin-baseline.json"
+    report_path = tmp_path / "report.json"
+    expected = {
+        "schema_version": 3,
+        "scope": {"repository": "MoviePilot-Plugins", "roots": ["plugins.v3"]},
+        "provenance": {
+            "head": "a" * 40,
+            "python_file_count": 1,
+            "source_sha256": "a" * 64,
+        },
+        "imports": {},
+        "hooks": {},
+        "api_routes": {},
+    }
+    actual = json.loads(json.dumps(expected))
+    actual["provenance"]["head"] = "b" * 40
+    actual["imports"] = {
+        "app.sdk.logging": {"file_count": 1, "files": ["plugins.v3/demo.py"]}
+    }
+    baseline_path.write_text(json.dumps(expected), encoding="utf-8")
+    content_before = baseline_path.read_bytes()
+    monkeypatch.setattr(
+        architecture_baseline,
+        "PLUGIN_BASELINE_PATH",
+        baseline_path,
+    )
+    monkeypatch.setattr(
+        architecture_baseline,
+        "collect_official_plugin_baseline",
+        lambda _repository: actual,
+    )
+
+    assert architecture_baseline.main(
+        [
+            "--check-plugins",
+            "--plugin-repo",
+            str(plugin_repo),
+            "--report",
+            str(report_path),
+        ]
+    ) == 1
+
+    report = json.loads(report_path.read_text(encoding="utf-8"))
+    assert baseline_path.read_bytes() == content_before
+    assert report["checks"][0]["semantic_match"] is False
+    assert report["checks"][0]["added"] == [
+        {
+            "path": "$.imports.app.sdk.logging",
+            "value": {"file_count": 1, "files": ["plugins.v3/demo.py"]},
+        }
+    ]
+
+
 def test_performance_default_print_does_not_write_fixture(
     tmp_path: Path,
     monkeypatch,
diff --git a/tests/test_architecture_ci.py b/tests/test_architecture_ci.py
new file mode 100644
index 000000000..06cbaf4b7
--- /dev/null
+++ b/tests/test_architecture_ci.py
@@ -0,0 +1,60 @@
+"""后端架构治理工作流的静态契约测试。"""
+
+from pathlib import Path
+
+from ruamel.yaml import YAML
+
+
+PROJECT_ROOT = Path(__file__).parents[1]
+WORKFLOW_ROOT = PROJECT_ROOT / ".github" / "workflows"
+
+
+def _load_workflow(name: str) -> dict:
+    """以 YAML 1.2 解析 GitHub Actions 工作流。"""
+    yaml = YAML(typ="safe")
+    return yaml.load((WORKFLOW_ROOT / name).read_text(encoding="utf-8"))
+
+
+def _step_commands(workflow: dict, job_name: str) -> str:
+    """拼接指定 job 的命令，便于断言关键门禁没有被移除。"""
+    return "\n".join(
+        step.get("run", "")
+        for step in workflow["jobs"][job_name]["steps"]
+    )
+
+
+def test_unit_test_workflow_has_independent_host_architecture_gate():
+    """主仓 PR 与推送必须在全量分片外快速执行宿主架构门禁。"""
+    workflow = _load_workflow("test.yml")
+    commands = _step_commands(workflow, "architecture")
+
+    assert "pull_request" in workflow["on"]
+    assert "push" in workflow["on"]
+    assert "tests/test_architecture_dependencies.py" in commands
+    assert "tests/test_architecture_contract_baseline.py" in commands
+    assert "scripts/architecture/baseline.py --check-host" in commands
+
+
+def test_official_plugin_observation_is_scheduled_and_never_writes_fixture():
+    """跨仓观察应定时或手工运行，只上传语义报告而不刷新 fixture。"""
+    workflow = _load_workflow("architecture-observe.yml")
+    commands = _step_commands(workflow, "observe")
+    steps = workflow["jobs"]["observe"]["steps"]
+
+    assert "schedule" in workflow["on"]
+    assert "workflow_dispatch" in workflow["on"]
+    assert "--check-plugins" in commands
+    assert "--report official-plugin-architecture-report.json" in commands
+    assert "--write" not in commands
+    assert any(
+        step.get("uses", "").startswith("actions/upload-artifact@")
+        for step in steps
+    )
+
+
+def test_pylint_workflow_runs_for_v3_pull_requests_and_pushes():
+    """严重 Python 静态错误检查不能继续只依赖手工触发。"""
+    workflow = _load_workflow("pylint.yml")
+
+    assert workflow["on"]["pull_request"]["branches"] == ["v3"]
+    assert workflow["on"]["push"]["branches"] == ["v3"]