feat: lightweight bootstrap context mode for heartbeat/cron runs (openclaw#26064) thanks @jose-velez

Verified:
- pnpm build
- pnpm check (fails on pre-existing unrelated repo issues in extensions/diffs and src/agents/tools/nodes-tool.test.ts)
- pnpm vitest run src/agents/bootstrap-files.test.ts src/infra/heartbeat-runner.model-override.test.ts src/cli/cron-cli.test.ts
- pnpm test:macmini (fails on pre-existing extensions/diffs import errors; touched suites pass)

Co-authored-by: jose-velez <10926182+jose-velez@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/cron/types.ts

@@ -75,6 +75,8 @@ export type CronPayload =
       thinking?: string;
       timeoutSeconds?: number;
       allowUnsafeExternalContent?: boolean;
+      /** If true, run with lightweight bootstrap context. */
+      lightContext?: boolean;
       deliver?: boolean;
       channel?: CronMessageChannel;
       to?: string;
@@ -91,6 +93,8 @@ export type CronPayloadPatch =
       thinking?: string;
       timeoutSeconds?: number;
       allowUnsafeExternalContent?: boolean;
+      /** If true, run with lightweight bootstrap context. */
+      lightContext?: boolean;
       deliver?: boolean;
       channel?: CronMessageChannel;
       to?: string;