Investigate suitability use of fixed launcher arg `max_old_space_size=512`

### Current Behavior

REF: https://discourse.nodered.org/t/flowfuse-device-agent-crashes-fatal-error-reached-heap-limit-allocation-failed-javascript-heap-out-of-memory/96822/5

### Expected Behavior

Users flows should not be impacted

### Steps To Reproduce

I dont have a repro, only conversational evidence.

### Environment
- Device Agent Version: @flowfuse/device-agent@3.2.0 with Node-RED v3.1.8
- FlowFuse version:
- Node.js version: v20.19.1
- npm version:
- Platform/OS:
- Browser:

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate