feat!: move msteams to plugin

extensions/msteams/src/inbound.ts

@@ -0,0 +1,38 @@
+export type MentionableActivity = {
+  recipient?: { id?: string } | null;
+  entities?: Array<{
+    type?: string;
+    mentioned?: { id?: string };
+  }> | null;
+};
+
+export function normalizeMSTeamsConversationId(raw: string): string {
+  return raw.split(";")[0] ?? raw;
+}
+
+export function extractMSTeamsConversationMessageId(raw: string): string | undefined {
+  if (!raw) return undefined;
+  const match = /(?:^|;)messageid=([^;]+)/i.exec(raw);
+  const value = match?.[1]?.trim() ?? "";
+  return value || undefined;
+}
+
+export function parseMSTeamsActivityTimestamp(value: unknown): Date | undefined {
+  if (!value) return undefined;
+  if (value instanceof Date) return value;
+  if (typeof value !== "string") return undefined;
+  const date = new Date(value);
+  return Number.isNaN(date.getTime()) ? undefined : date;
+}
+
+export function stripMSTeamsMentionTags(text: string): string {
+  // Teams wraps mentions in <at>...</at> tags
+  return text.replace(/<at[^>]*>.*?<\/at>/gi, "").trim();
+}
+
+export function wasMSTeamsBotMentioned(activity: MentionableActivity): boolean {
+  const botId = activity.recipient?.id;
+  if (!botId) return false;
+  const entities = activity.entities ?? [];
+  return entities.some((e) => e.type === "mention" && e.mentioned?.id === botId);
+}