fix: run BOOT.md for each configured agent at startup (#20569)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: 9098a4cc64
Co-authored-by: mcaxtr <7562095+mcaxtr@users.noreply.github.com>
Co-authored-by: gumadeiras <5599352+gumadeiras@users.noreply.github.com>
Reviewed-by: @gumadeiras

src/hooks/internal-hooks.ts

@@ -6,6 +6,7 @@
  */
 
 import type { WorkspaceBootstrapFile } from "../agents/workspace.js";
+import type { CliDeps } from "../cli/deps.js";
 import type { OpenClawConfig } from "../config/config.js";
 
 export type InternalHookEventType = "command" | "session" | "agent" | "gateway" | "message";
@@ -25,6 +26,18 @@ export type AgentBootstrapHookEvent = InternalHookEvent & {
   context: AgentBootstrapHookContext;
 };
 
+export type GatewayStartupHookContext = {
+  cfg?: OpenClawConfig;
+  deps?: CliDeps;
+  workspaceDir?: string;
+};
+
+export type GatewayStartupHookEvent = InternalHookEvent & {
+  type: "gateway";
+  action: "startup";
+  context: GatewayStartupHookContext;
+};
+
 // ============================================================================
 // Message Hook Events
 // ============================================================================
@@ -234,6 +247,14 @@ export function isAgentBootstrapEvent(event: InternalHookEvent): event is AgentB
   return Array.isArray(context.bootstrapFiles);
 }
 
+export function isGatewayStartupEvent(event: InternalHookEvent): event is GatewayStartupHookEvent {
+  if (event.type !== "gateway" || event.action !== "startup") {
+    return false;
+  }
+  const context = event.context as GatewayStartupHookContext | null;
+  return Boolean(context && typeof context === "object");
+}
+
 export function isMessageReceivedEvent(
   event: InternalHookEvent,
 ): event is MessageReceivedHookEvent {