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/test_isolation.rs

@@ -2,6 +2,7 @@
 // ROADMAP #41: Stop ambient plugin state from skewing CLI regression checks
 
 use std::env;
+use std::fs;
 use std::path::PathBuf;
 use std::sync::atomic::{AtomicU64, Ordering};
 use std::sync::Mutex;