Integration tests read the developer's real `~/.config/pmacs/init.lua`.
The suite is green in CI and deterministically red on any machine with a
real config, attributed to whatever branch is checked out — 11 of 67 in
`compile_mode_acceptance` on 2026-07-30, 67/67 with an isolated
`XDG_CONFIG_HOME`.
The mechanism is that `src/editor.rs:770` guards config loading with
`#[cfg(not(test))]`, which is set only when compiling the crate's own
unit tests. An integration test links pmacs as an ordinary dependency, so
the guard is inactive for all 96 of them. The hazard was identified and a
mitigation was written; its scope does not match the threat.
The obvious fix is unavailable: `std::env::set_var` is unsafe and the
crate forbids unsafe, which the repo already knows —
`Installer::root_override` exists for exactly this reason.
Framing only, awaiting review round 1. No code changes.
