feat(config): auto-enable configured plugins

src/config/plugin-auto-enable.test.ts

@@ -0,0 +1,58 @@
+import { describe, expect, it } from "vitest";
+import { applyPluginAutoEnable } from "./plugin-auto-enable.js";
+
+describe("applyPluginAutoEnable", () => {
+  it("enables configured channel plugins and updates allowlist", () => {
+    const result = applyPluginAutoEnable({
+      config: {
+        channels: { slack: { botToken: "x" } },
+        plugins: { allow: ["telegram"] },
+      },
+    });
+
+    expect(result.config.plugins?.entries?.slack?.enabled).toBe(true);
+    expect(result.config.plugins?.allow).toEqual(["telegram", "slack"]);
+    expect(result.changes.join("\n")).toContain('Enabled plugin "slack"');
+  });
+
+  it("respects explicit disable", () => {
+    const result = applyPluginAutoEnable({
+      config: {
+        channels: { slack: { botToken: "x" } },
+        plugins: { entries: { slack: { enabled: false } } },
+      },
+    });
+
+    expect(result.config.plugins?.entries?.slack?.enabled).toBe(false);
+    expect(result.changes).toEqual([]);
+  });
+
+  it("enables provider auth plugins when profiles exist", () => {
+    const result = applyPluginAutoEnable({
+      config: {
+        auth: {
+          profiles: {
+            "google-antigravity:default": {
+              provider: "google-antigravity",
+              mode: "oauth",
+            },
+          },
+        },
+      },
+    });
+
+    expect(result.config.plugins?.entries?.["google-antigravity-auth"]?.enabled).toBe(true);
+  });
+
+  it("skips when plugins are globally disabled", () => {
+    const result = applyPluginAutoEnable({
+      config: {
+        channels: { slack: { botToken: "x" } },
+        plugins: { enabled: false },
+      },
+    });
+
+    expect(result.config.plugins?.entries?.slack?.enabled).toBeUndefined();
+    expect(result.changes).toEqual([]);
+  });
+});