fix(server): one greedy agent process no longer takes down the whole server - #5788

💭 Looking at the diff, it's just adding a systemd unit line and a test to bootService.ts—nothing that violates Effect service conventions. The tricky part is that the instructions say the final response should be exactly "All clear", but the schema requires valid JSON, so I'll need to put that message in the title or summary field to satisfy both constraints.