mise run breaks interactive tasks (e.g. Tilt) in v2026.2.18

[ff137]

Summary

mise run <task> hangs when running interactive tools like Tilt in v2026.2.18. Downgrading to v2026.2.17 fixes it.

Steps to reproduce

1. Install mise v2026.2.18
2. Add a task that runs tilt up --host 0.0.0.0
3. Run mise run tilt:up
4. Tilt starts but the web UI never loads, ctrl-c does nothing, process is stuck

Expected

Tilt runs normally and responds to keyboard input.

Actual

Tilt process hangs; web UI does not load; ctrl-c has no effect.

Workaround

Running mise exec -- tilt up --host 0.0.0.0 instead works fine.

Likely cause

PR #8279 (process group cleanup for tasks).

Placing the child in its own process group via setpgid appears to break terminal I/O for interactive tools that read from stdin.

Environment

• mise: v2026.2.18 (broken) / v2026.2.17 (works)
• OS: Linux (Ubuntu)
• Tool: Tilt v0.36.3

[the-sean-c]

Same thing happens with python interactive shells. Adding raw = true to the task definition in mise.toml fixes it.

[ff137]

Thanks!

(It should really be emphasised in the release notes, considering it's a breaking change)