fix(plugins): preserve source activation config

src/plugins/runtime/load-context.test.ts

@@ -12,6 +12,8 @@ const resolveDefaultAgentIdMock = vi.fn<
 
 let resolvePluginRuntimeLoadContext: typeof import("./load-context.js").resolvePluginRuntimeLoadContext;
 let buildPluginRuntimeLoadOptions: typeof import("./load-context.js").buildPluginRuntimeLoadOptions;
+let clearRuntimeConfigSnapshot: typeof import("../../config/runtime-snapshot.js").clearRuntimeConfigSnapshot;
+let setRuntimeConfigSnapshot: typeof import("../../config/runtime-snapshot.js").setRuntimeConfigSnapshot;
 
 vi.mock("../../config/config.js", () => ({
   loadConfig: loadConfigMock,
@@ -29,6 +31,8 @@ vi.mock("../../agents/agent-scope.js", () => ({
 describe("resolvePluginRuntimeLoadContext", () => {
   beforeEach(async () => {
     vi.resetModules();
+    ({ clearRuntimeConfigSnapshot, setRuntimeConfigSnapshot } =
+      await import("../../config/runtime-snapshot.js"));
     ({ resolvePluginRuntimeLoadContext, buildPluginRuntimeLoadOptions } =
       await import("./load-context.js"));
     loadConfigMock.mockReset();
@@ -42,6 +46,7 @@ describe("resolvePluginRuntimeLoadContext", () => {
       changes: [],
       autoEnabledReasons: {},
     }));
+    clearRuntimeConfigSnapshot();
   });
 
   it("builds the runtime plugin load context from the auto-enabled config", () => {
@@ -88,6 +93,27 @@ describe("resolvePluginRuntimeLoadContext", () => {
     expect(resolveAgentWorkspaceDirMock).toHaveBeenCalledWith(resolvedConfig, "default");
   });
 
+  it("uses the source runtime snapshot for plugin activation source config", () => {
+    const runtimeConfig = { plugins: {} };
+    const sourceConfig = {
+      plugins: {
+        allow: ["trusted-plugin"],
+      },
+    };
+
+    setRuntimeConfigSnapshot(runtimeConfig, sourceConfig);
+    loadConfigMock.mockReturnValue(runtimeConfig);
+
+    const context = resolvePluginRuntimeLoadContext();
+
+    expect(context.rawConfig).toBe(runtimeConfig);
+    expect(context.activationSourceConfig).toBe(sourceConfig);
+    expect(applyPluginAutoEnableMock).toHaveBeenCalledWith({
+      config: runtimeConfig,
+      env: process.env,
+    });
+  });
+
   it("builds plugin load options from the shared runtime context", () => {
     const context = resolvePluginRuntimeLoadContext({
       config: { plugins: {} },