docs(roadmap): add #68 — internal reinjection/resume path opacity

OMX lanes leaking internal control prose like [OMX_TMUX_INJECT]
instead of operator-meaningful state. Adding requirement for
structured recovery/reinject events with clear cause, preserved
state, and target lane info.

Also fixes merge conflict in test_isolation.rs.

Source: gaebal-gajae dogfood analysis 2026-04-12

rust/crates/plugins/src/lib.rs

@@ -4,6 +4,7 @@ pub mod test_isolation;
 
 use std::collections::{BTreeMap, BTreeSet};
 use std::fmt::{Display, Formatter};
+use std::sync::atomic::{AtomicU64, Ordering};
 use std::fs;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};