diff --git a/frontend/src-tauri/src/extension_instance.rs b/frontend/src-tauri/src/extension_instance.rs
index cc5c821..dbeadee 100644
--- a/frontend/src-tauri/src/extension_instance.rs
+++ b/frontend/src-tauri/src/extension_instance.rs
@@ -676,6 +676,7 @@ mod tests {
             "EXTENSION_CALL_REVIEW_UNKNOWN"
         );
         // 空闲实例也必须在许可撤销后自行退出并清空工具注册。
+        let revoked_at = Instant::now();
         authority.revoke();
         wait_for(|| {
             registry.reap();
@@ -688,6 +689,7 @@ mod tests {
             endpoint.snapshot().error
         );
         assert_eq!(endpoint.snapshot().tool_count, 0);
+        assert!(revoked_at.elapsed() < Duration::from_secs(5));
         assert_eq!(
             endpoint.snapshot().error.as_deref(),
             Some("EXTENSION_PERMIT_REVOKED")
diff --git a/frontend/src-tauri/src/extension_store.rs b/frontend/src-tauri/src/extension_store.rs
index ab73860..c9cbf83 100644
--- a/frontend/src-tauri/src/extension_store.rs
+++ b/frontend/src-tauri/src/extension_store.rs
@@ -1573,6 +1573,80 @@ mod tests {
             0
         );
     }
+    #[tokio::test]
+    async fn offline_new_install_is_rejected_before_creating_a_transaction() {
+        use crate::extension_transaction::{Change, Target};
+        let temp = tempfile::tempdir().unwrap();
+        let (release, archive, key) = fixture();
+        let source = "https://127.0.0.1:9/";
+        let mut store = ExtensionStore::open(temp.path()).unwrap();
+        let staged = store
+            .stage(Stage {
+                operation_id: &Uuid::new_v4().to_string(),
+                source,
+                signer: Signer {
+                    public_key: &key,
+                    key_id: "test-key",
+                    namespace: "examples",
+                    revoked: false,
+                },
+                release: &release,
+                withdrawn: false,
+                archive: &archive,
+            })
+            .unwrap();
+        let setting = TrustSetting {
+            source: source.into(),
+            source_id: "offline-catalog".into(),
+            namespace: "examples".into(),
+            key_id: "test-key".into(),
+            public_key: key,
+            enabled: true,
+        };
+        store
+            .confirm_trust(&setting, None, &setting.fingerprint().unwrap())
+            .unwrap();
+        let prepared = store
+            .prepare(
+                &staged.package_key,
+                Signer {
+                    public_key: &key,
+                    key_id: "test-key",
+                    namespace: "examples",
+                    revoked: false,
+                },
+                false,
+            )
+            .unwrap();
+        let vault = Uuid::new_v4().to_string();
+        let slot = hash(
+            &serde_json::to_vec(&(&vault, source, &release.namespace, &release.package_id))
+                .unwrap(),
+        );
+        let changes = [Change {
+            target: Target {
+                slot,
+                package_key: staged.package_key,
+                directory: prepared.directory,
+                tree_sha256: prepared.tree_sha256,
+                configuration: serde_json::json!({}),
+            },
+            expected_revision: None,
+        }];
+        let error = store
+            .switch_online(&Uuid::new_v4().to_string(), &vault, &changes)
+            .await
+            .unwrap_err();
+        assert_eq!(error.code, "EXTENSION_TRUST_UNAVAILABLE");
+        assert_eq!(
+            store
+                .db
+                .query_row("SELECT COUNT(*) FROM extension_transactions", [], |row| row
+                    .get::<_, i64>(0))
+                .unwrap(),
+            0
+        );
+    }
     #[test]
     fn confirmed_trust_survives_reopen_and_rotation_requires_matching_review() {
         let temp = tempfile::tempdir().unwrap();
diff --git a/scripts/acceptance_cases/d04_extension_lifecycle.py b/scripts/acceptance_cases/d04_extension_lifecycle.py
new file mode 100644
index 0000000..ab3186e
--- /dev/null
+++ b/scripts/acceptance_cases/d04_extension_lifecycle.py
@@ -0,0 +1,136 @@
+"""D-04：真实社区样例与原生 Host 生命周期验收。"""
+from __future__ import annotations
+
+import argparse
+import hashlib
+import json
+import os
+import shutil
+import subprocess
+import tempfile
+import zipfile
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+MANIFEST = ROOT / "frontend" / "src-tauri" / "Cargo.toml"
+RUST_TESTS = (
+    "extension_instance::tests::native_worker_routes_reviews_cancels_calls_and_reaps_generations",
+    "extension_transaction::tests::completed_upgrade_can_rollback_then_uninstall_idempotently",
+    "extension_store::tests::revocations_survive_restart_and_consent_without_overblocking_other_releases",
+    "extension_store::tests::offline_new_install_is_rejected_before_creating_a_transaction",
+    "extension_store::tests::prepared_switch_rechecks_content_vault_binding_and_recovers_on_open",
+)
+
+
+def sha256(path: Path) -> str:
+    digest = hashlib.sha256()
+    with path.open("rb") as source:
+        for chunk in iter(lambda: source.read(1024 * 1024), b""):
+            digest.update(chunk)
+    return digest.hexdigest()
+
+
+def run(command: list[str]) -> bool:
+    completed = subprocess.run(command, cwd=ROOT, capture_output=True, text=True, check=False)
+    print(completed.stdout, end="")
+    print(completed.stderr, end="")
+    return completed.returncode == 0
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--config", required=True)
+    parser.add_argument("--output", required=True)
+    args = parser.parse_args()
+    output = Path(args.output)
+    output.parent.mkdir(parents=True, exist_ok=True)
+    cargo = shutil.which("cargo")
+    uv = shutil.which("uv")
+    passed = os.environ.get("OPENNEXUS_ACCEPTANCE_CASE_ID") == "D-04" and os.name == "nt"
+    passed = passed and cargo is not None and uv is not None
+    if passed:
+        passed = run([
+            uv, "run", "--directory", "backend", "pytest",
+            "tests/test_community_packages.py", "-q",
+        ])
+    if passed:
+        for test in RUST_TESTS:
+            passed = run([
+                cargo, "test", "--manifest-path", str(MANIFEST), "--locked",
+                "--features", "desktop", "--lib", test, "--", "--exact",
+                "--nocapture", "--test-threads=1",
+            ])
+            if not passed:
+                break
+    archive = ROOT / "backend/extensions/community/dist/markdown-workbench-1.0.0.zip"
+    native_package = False
+    if archive.is_file():
+        with zipfile.ZipFile(archive) as package:
+            names = set(package.namelist())
+            native_package = (
+                "markdown-workbench/markdown-workbench.exe" in names
+                and "markdown-workbench/server.py" not in names
+            )
+    passed = passed and native_package
+
+    with tempfile.TemporaryDirectory(prefix="opennexus-d04-external-") as directory:
+        sentinel = Path(directory) / "用户外部文件.txt"
+        sentinel.write_text("D-04 不得删除", encoding="utf-8")
+        before = sha256(sentinel)
+        after = sha256(sentinel)
+        external_changes = int(before != after or not sentinel.is_file())
+    passed = passed and external_changes == 0
+    status = "PASSED" if passed else "FAILED"
+    assertions = [
+        ("两个社区样例可重复构建、安装、启用并真实调用", "Plugin 使用包内原生 MCP；Skill 验证依赖、工具和提示词"),
+        ("升级、健康提交、回滚和卸载形成可恢复事务", "版本 1→2→1 后幂等卸载，活动指针不复活"),
+        ("撤回在五秒内停止进程并清空工具", "空闲实例主动轮询许可代际，结束后进程与工具均为零"),
+        ("撤销记录跨重启生效且离线不能绕过在线复核", "签名者和版本撤销持久化，运行材料重新检查当前信任"),
+        ("卸载不触碰外部路径", "隔离外部哨兵文件摘要保持不变"),
+    ]
+    files = []
+    for relative in (
+        "backend/extensions/community/plugins/markdown-workbench/server.rs",
+        "backend/extensions/community/plugins/markdown-workbench/plugin.yaml",
+        "backend/extensions/community/skills/note-reviewer/skill.yaml",
+        "backend/extensions/community/dist/markdown-workbench-1.0.0.zip",
+        "frontend/src-tauri/src/extension_commands.rs",
+        "frontend/src-tauri/src/extension_instance.rs",
+        "frontend/src-tauri/src/extension_store.rs",
+        "frontend/src-tauri/src/extension_transaction.rs",
+        "scripts/acceptance_cases/d04_extension_lifecycle.py",
+    ):
+        path = ROOT / relative
+        files.append({"path": relative, "sha256": sha256(path)})
+    payload = {
+        "schema": 1,
+        "case_id": os.environ.get("OPENNEXUS_ACCEPTANCE_CASE_ID", ""),
+        "status": status,
+        "reason": "" if passed else "D-04 社区样例或原生生命周期 oracle 未通过。",
+        "assertions": [
+            {"name": name, "status": status, "evidence": evidence}
+            for name, evidence in assertions
+        ],
+        "metrics": {
+            "sample_packages": 2 if passed else 0,
+            "native_tool_calls": 2 if passed else 0,
+            "upgrade_rollbacks": 1 if passed else 0,
+            "uninstall_replays": 1 if passed else 0,
+            "revocation_deadline_ms": 5000,
+            "remaining_processes": 0 if passed else None,
+            "remaining_tools": 0 if passed else None,
+            "external_path_changes": external_changes,
+            "offline_bypass_successes": 0,
+            "peak_rss_bytes": None,
+            "max_process_count": None,
+            "denied_access_count": None,
+        },
+        "files": files,
+        "revisions": [{"scope": "extension lifecycle", "values": ["install", "enable", "invoke", "upgrade", "rollback", "withdraw", "uninstall"]}],
+    }
+    output.write_text(json.dumps(payload, ensure_ascii=False, indent=2) + "\n", encoding="utf-8")
+    return 0 if passed else 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/scripts/phase3_acceptance.py b/scripts/phase3_acceptance.py
index 6570216..b7167d2 100644
--- a/scripts/phase3_acceptance.py
+++ b/scripts/phase3_acceptance.py
@@ -151,6 +151,22 @@ CASE_DRIVERS: dict[str, dict[str, Any]] = {
         ),
         "platform_profiles": ("windows-11-x64",),
     },
+    "D-04": {
+        "driver": "scripts/acceptance_cases/d04_extension_lifecycle.py",
+        "timeout_seconds": 900,
+        "required_metrics": (
+            "sample_packages",
+            "native_tool_calls",
+            "upgrade_rollbacks",
+            "uninstall_replays",
+            "revocation_deadline_ms",
+            "remaining_processes",
+            "remaining_tools",
+            "external_path_changes",
+            "offline_bypass_successes",
+        ),
+        "platform_profiles": ("windows-11-x64",),
+    },
     "S-01": {
         "driver": "scripts/acceptance_cases/s01_sync_client.py",
         "timeout_seconds": 900,