fix: treat reply-to-bot as implicit mention across channels

src/channels/mention-gating.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, it } from "vitest";
+
+import { resolveMentionGating } from "./mention-gating.js";
+
+describe("resolveMentionGating", () => {
+  it("combines explicit, implicit, and bypass mentions", () => {
+    const res = resolveMentionGating({
+      requireMention: true,
+      canDetectMention: true,
+      wasMentioned: false,
+      implicitMention: true,
+      shouldBypassMention: false,
+    });
+    expect(res.effectiveWasMentioned).toBe(true);
+    expect(res.shouldSkip).toBe(false);
+  });
+
+  it("skips when mention required and none detected", () => {
+    const res = resolveMentionGating({
+      requireMention: true,
+      canDetectMention: true,
+      wasMentioned: false,
+      implicitMention: false,
+      shouldBypassMention: false,
+    });
+    expect(res.effectiveWasMentioned).toBe(false);
+    expect(res.shouldSkip).toBe(true);
+  });
+
+  it("does not skip when mention detection is unavailable", () => {
+    const res = resolveMentionGating({
+      requireMention: true,
+      canDetectMention: false,
+      wasMentioned: false,
+    });
+    expect(res.shouldSkip).toBe(false);
+  });
+});