feat(telegram/acp): Topic Binding, Pin Binding Message, Fix Spawn Param Parsing (#36683)

* fix(acp): normalize unicode flags and Telegram topic binding

* feat(telegram/acp): restore topic-bound ACP and session bindings

* fix(acpx): clarify permission-denied guidance

* feat(telegram/acp): pin spawn bind notice in topics

* docs(telegram): document ACP topic thread binding behavior

* refactor(reply): share Telegram conversation-id resolver

* fix(telegram/acp): preserve bound session routing semantics

* fix(telegram): respect binding persistence and expiry reporting

* refactor(telegram): simplify binding lifecycle persistence

* fix(telegram): bind acp spawns in direct messages

* fix: document telegram ACP topic binding changelog (#36683) (thanks @huntharo)

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Co-authored-by: Onur <2453968+osolmaz@users.noreply.github.com>

src/auto-reply/reply/channel-context.ts

@@ -0,0 +1,45 @@
+type DiscordSurfaceParams = {
+  ctx: {
+    OriginatingChannel?: string;
+    Surface?: string;
+    Provider?: string;
+    AccountId?: string;
+  };
+  command: {
+    channel?: string;
+  };
+};
+
+type DiscordAccountParams = {
+  ctx: {
+    AccountId?: string;
+  };
+};
+
+export function isDiscordSurface(params: DiscordSurfaceParams): boolean {
+  return resolveCommandSurfaceChannel(params) === "discord";
+}
+
+export function isTelegramSurface(params: DiscordSurfaceParams): boolean {
+  return resolveCommandSurfaceChannel(params) === "telegram";
+}
+
+export function resolveCommandSurfaceChannel(params: DiscordSurfaceParams): string {
+  const channel =
+    params.ctx.OriginatingChannel ??
+    params.command.channel ??
+    params.ctx.Surface ??
+    params.ctx.Provider;
+  return String(channel ?? "")
+    .trim()
+    .toLowerCase();
+}
+
+export function resolveDiscordAccountId(params: DiscordAccountParams): string {
+  return resolveChannelAccountId(params);
+}
+
+export function resolveChannelAccountId(params: DiscordAccountParams): string {
+  const accountId = typeof params.ctx.AccountId === "string" ? params.ctx.AccountId.trim() : "";
+  return accountId || "default";
+}