NixOS configuration for all my personal hosts.

omp-manager: remove queued follow-up messages #45

targeting main from deleted fork:fix/remove-omp-follow-up
Merged opened by and assigned to callie.on-her.computer
targeting main from deleted fork:fix/remove-omp-follow-up

Pins omp-manager 83841be. Task messages now always use OMP steering. The CLI, manager API, and worker reject follow_up mode. The manager test suite passes, and the Homura NixOS system build succeeds.

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