feat: add sessions tools and send policy

src/auto-reply/send-policy.ts

@@ -0,0 +1,29 @@
+export type SendPolicyOverride = "allow" | "deny";
+
+export function normalizeSendPolicyOverride(
+  raw?: string | null,
+): SendPolicyOverride | undefined {
+  const value = raw?.trim().toLowerCase();
+  if (!value) return undefined;
+  if (value === "allow" || value === "on") return "allow";
+  if (value === "deny" || value === "off") return "deny";
+  return undefined;
+}
+
+export function parseSendPolicyCommand(raw?: string): {
+  hasCommand: boolean;
+  mode?: SendPolicyOverride | "inherit";
+} {
+  if (!raw) return { hasCommand: false };
+  const trimmed = raw.trim();
+  if (!trimmed) return { hasCommand: false };
+  const match = trimmed.match(/^\/?send\b(?:\s+([a-zA-Z]+))?/i);
+  if (!match) return { hasCommand: false };
+  const token = match[1]?.trim().toLowerCase();
+  if (!token) return { hasCommand: true };
+  if (token === "inherit" || token === "default" || token === "reset") {
+    return { hasCommand: true, mode: "inherit" };
+  }
+  const mode = normalizeSendPolicyOverride(token);
+  return { hasCommand: true, mode };
+}