test: add Linux rig validation suite

Runs encoder verification, Wayland and X11 capture with segment and remux
checks, and five failure scenarios that must end in an honest failed status:
source lost, window closed, unwritable segments, low disk space and a portal
that grants no source.

crates/clipbin-probe/src/main.rs

@@ -324,6 +324,7 @@ fn record(options: &Options) -> Result<bool, Box<dyn std::error::Error>> {
         Duration::from_secs(options.segment_seconds as u64),
     );
     let mut status = RecordingStatus::Starting;
+    let mut recorded = false;
     println!("t={} status={}", elapsed(), status.label());
 
     let stop_at = started + Duration::from_secs(options.seconds);
@@ -349,6 +350,7 @@ fn record(options: &Options) -> Result<bool, Box<dyn std::error::Error>> {
                 health.written_bytes
             );
             report_status(&mut status, tracker.sample(&health, now), &elapsed());
+            recorded |= status == RecordingStatus::Recording;
         }
         if !stopping && (now >= stop_at || matches!(status, RecordingStatus::Failed { .. })) {
             stopping = true;
@@ -382,7 +384,10 @@ fn record(options: &Options) -> Result<bool, Box<dyn std::error::Error>> {
     if let Some(token) = recording.restore_token() {
         println!("restore_token={token}");
     }
-    Ok(outcome == Some(StopReason::Success) && !matches!(status, RecordingStatus::Failed { .. }))
+    println!("recorded={recorded}");
+    Ok(recorded
+        && outcome == Some(StopReason::Success)
+        && !matches!(status, RecordingStatus::Failed { .. }))
 }
 
 fn report_status(shown: &mut RecordingStatus, current: &RecordingStatus, elapsed: &str) {