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

src/channels/mention-gating.ts

@@ -0,0 +1,21 @@
+export type MentionGateParams = {
+  requireMention: boolean;
+  canDetectMention: boolean;
+  wasMentioned: boolean;
+  implicitMention?: boolean;
+  shouldBypassMention?: boolean;
+};
+
+export type MentionGateResult = {
+  effectiveWasMentioned: boolean;
+  shouldSkip: boolean;
+};
+
+export function resolveMentionGating(params: MentionGateParams): MentionGateResult {
+  const implicit = params.implicitMention === true;
+  const bypass = params.shouldBypassMention === true;
+  const effectiveWasMentioned = params.wasMentioned || implicit || bypass;
+  const shouldSkip =
+    params.requireMention && params.canDetectMention && !effectiveWasMentioned;
+  return { effectiveWasMentioned, shouldSkip };
+}