evsieve build hangs on a hidden sudo/TTY prompt (SIGTTIN→stopped) — wedges the whole install ~15 min

[aradanmn]

Problem

install_evsieve can hang the entire installer on a hidden prompt. Observed
2026-07-21 on a real Deck install: the build sat with zero CPU, target/ flat,
and the process tree showed distrobox in state T (stopped) and podman exec --interactive in Tl — i.e. SIGTTIN-stopped. The interactive podman session
tried to read the controlling TTY (almost certainly a sudo password prompt), and
because output is sent to /dev/null the prompt was invisible. It only unblocks when
the timeout 900 fires (~15 min) → fail-open.

Likely trigger: a freshly-created box (here, after podman system reset wiped
container storage) where distrobox's passwordless-sudo init hadn't taken effect, so
sudo apt-get in _evsieve_build_in_box prompted. modules/evsieve_management.sh
redirects the build's stdout/stderr to /dev/null but leaves stdin on the TTY.

Fix ideas

• In _evsieve_build_in_box, run the build with stdin detached (< /dev/null) so a
  prompt fails fast instead of hanging; and/or sudo -n (non-interactive) so it errors
  immediately when a password would be needed.
• Ensure the box is fully initialized (NOPASSWD sudo ready) before building, or build as
  root without sudo, or don't pass --interactive for a non-interactive command.
• Shorten the effective wait / surface a clear "waiting on the build box" state instead
  of a silent 15-min stall.

Acceptance

A fresh-box install builds evsieve without ever blocking on input; if the box/
toolchain can't be prepared it fail-opens promptly, not after a 15-min TTY stall.

Related

Surfaced alongside the build progress-indicator work (PR #123). That PR's
run_with_spinner backgrounds its command, so it also needs </dev/null (done on the
branch) — same SIGTTIN class of bug.

[aradanmn]

Fixed via #123 (merged, 89da2a1). Root cause: _evsieve_ensure_box returned after distrobox create without entering the box, so the container's first-run init (passwordless sudo setup) hadn't run when the build's first sudo apt-get fired → SIGTTIN stall. Fix: ensure_box now distrobox enter -- true </dev/null to initialize before building; build uses sudo -n + </dev/null. Validated end-to-end on a Deck through the real installer — box prep 76s → cargo compile 40s → host-runnable evsieve 1.4.0, T-state 0 throughout (log: box created+initialized, no hang). Shipped alongside the build progress spinner.