feat(discord): add exec approval forwarding to DMs (#1621)

* feat(discord): add exec approval forwarding to DMs

Add support for forwarding exec approval requests to Discord DMs,
allowing users to approve/deny command execution via interactive buttons.

Features:
- New DiscordExecApprovalHandler that connects to gateway and listens
  for exec.approval.requested/resolved events
- Sends DMs with embeds showing command details and 3 buttons:
  Allow once, Always allow, Deny
- Configurable via channels.discord.execApprovals with:
  - enabled: boolean
  - approvers: Discord user IDs to notify
  - agentFilter: only forward for specific agents
  - sessionFilter: only forward for matching session patterns
- Updates message embed when approval is resolved or expires

Also fixes exec completion routing: when async exec completes after
approval, the heartbeat now uses a specialized prompt to ensure the
model relays the result to the user instead of responding HEARTBEAT_OK.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* feat: generic exec approvals forwarding (#1621) (thanks @czekaj)

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Peter Steinberger <steipete@gmail.com>

src/auto-reply/reply/commands-approve.test.ts

@@ -0,0 +1,83 @@
+import { describe, expect, it, vi } from "vitest";
+
+import type { ClawdbotConfig } from "../../config/config.js";
+import type { MsgContext } from "../templating.js";
+import { buildCommandContext, handleCommands } from "./commands.js";
+import { parseInlineDirectives } from "./directive-handling.js";
+import { callGateway } from "../../gateway/call.js";
+
+vi.mock("../../gateway/call.js", () => ({
+  callGateway: vi.fn(),
+}));
+
+function buildParams(commandBody: string, cfg: ClawdbotConfig, ctxOverrides?: Partial<MsgContext>) {
+  const ctx = {
+    Body: commandBody,
+    CommandBody: commandBody,
+    CommandSource: "text",
+    CommandAuthorized: true,
+    Provider: "whatsapp",
+    Surface: "whatsapp",
+    ...ctxOverrides,
+  } as MsgContext;
+
+  const command = buildCommandContext({
+    ctx,
+    cfg,
+    isGroup: false,
+    triggerBodyNormalized: commandBody.trim().toLowerCase(),
+    commandAuthorized: true,
+  });
+
+  return {
+    ctx,
+    cfg,
+    command,
+    directives: parseInlineDirectives(commandBody),
+    elevated: { enabled: true, allowed: true, failures: [] },
+    sessionKey: "agent:main:main",
+    workspaceDir: "/tmp",
+    defaultGroupActivation: () => "mention",
+    resolvedVerboseLevel: "off" as const,
+    resolvedReasoningLevel: "off" as const,
+    resolveDefaultThinkingLevel: async () => undefined,
+    provider: "whatsapp",
+    model: "test-model",
+    contextTokens: 0,
+    isGroup: false,
+  };
+}
+
+describe("/approve command", () => {
+  it("rejects invalid usage", async () => {
+    const cfg = {
+      commands: { text: true },
+      channels: { whatsapp: { allowFrom: ["*"] } },
+    } as ClawdbotConfig;
+    const params = buildParams("/approve", cfg);
+    const result = await handleCommands(params);
+    expect(result.shouldContinue).toBe(false);
+    expect(result.reply?.text).toContain("Usage: /approve");
+  });
+
+  it("submits approval", async () => {
+    const cfg = {
+      commands: { text: true },
+      channels: { whatsapp: { allowFrom: ["*"] } },
+    } as ClawdbotConfig;
+    const params = buildParams("/approve abc allow-once", cfg, { SenderId: "123" });
+
+    const mockCallGateway = vi.mocked(callGateway);
+    mockCallGateway.mockResolvedValueOnce({ ok: true });
+
+    const result = await handleCommands(params);
+    expect(result.shouldContinue).toBe(false);
+    expect(result.reply?.text).toContain("Exec approval allow-once submitted");
+    expect(mockCallGateway).toHaveBeenCalledWith(
+      expect.objectContaining({
+        method: "exec.approval.resolve",
+        params: { id: "abc", decision: "allow-once" },
+      }),
+    );
+  });
+});