refactor(config): unify streaming config across channels

src/commands/doctor-config-flow.e2e.test.ts

@@ -68,6 +68,42 @@ describe("doctor config flow", () => {
     });
   });
 
+  it("preserves discord streaming intent while stripping unsupported keys on repair", async () => {
+    const result = await runDoctorConfigWithInput({
+      repair: true,
+      config: {
+        channels: {
+          discord: {
+            streaming: true,
+            lifecycle: {
+              enabled: true,
+              reactions: {
+                queued: "⏳",
+                thinking: "🧠",
+                tool: "🔧",
+                done: "✅",
+                error: "❌",
+              },
+            },
+          },
+        },
+      },
+    });
+
+    const cfg = result.cfg as {
+      channels: {
+        discord: {
+          streamMode?: string;
+          streaming?: string;
+          lifecycle?: unknown;
+        };
+      };
+    };
+    expect(cfg.channels.discord.streaming).toBe("partial");
+    expect(cfg.channels.discord.streamMode).toBeUndefined();
+    expect(cfg.channels.discord.lifecycle).toBeUndefined();
+  });
+
   it("resolves Telegram @username allowFrom entries to numeric IDs on repair", async () => {
     const fetchSpy = vi.fn(async (url: string) => {
       const u = String(url);