From caeed9acdc676aa10f788e81edf45892b8cdcc8e Mon Sep 17 00:00:00 2001
From: cai <cai@nbcai.cc>
Date: Tue, 25 Aug 2026 12:48:13 +0800
Subject: [PATCH] fix(helper): bind ASR ingress to fixture generation

---
 src/main.rs |  515 ++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 files changed, 437 insertions(+), 78 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 8803bba..b18a534 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -70,7 +70,7 @@
 
 const CONTROLLED_FIXTURE_ACK_RESULTS: [&str; 4] =
     ["observed", "rejected", "timeout", "publish_failed"];
-const CONTROLLED_FIXTURE_REJECT_REASONS: [&str; 10] = [
+const CONTROLLED_FIXTURE_REJECT_REASONS: [&str; 16] = [
     "missing_attributes",
     "wrong_source",
     "missing_sequence",
@@ -80,6 +80,12 @@
     "duplicate_or_old_sequence",
     "no_current_participant",
     "ack_publish_failed",
+    "missing_generation",
+    "invalid_generation",
+    "wrong_generation",
+    "invalid_language",
+    "incomplete_metadata",
+    "invalid_source_or_sequence",
     "unknown",
 ];
 
@@ -127,6 +133,7 @@
 struct ControlledFixtureVisibilityEvidence {
     first_visible_bucket: &'static str,
     visibility_source: &'static str,
+    visibility_result: &'static str,
     binding_matched: bool,
 }
 
@@ -263,7 +270,7 @@
     trace_id_hash: &str,
     generation: u64,
     sequence: &str,
-    acknowledged_probe_sequences: &mut HashSet<String>,
+    acknowledged_probe_sequences: &mut HashSet<(u64, String)>,
 ) -> ControlledFixtureAckPublishOutcome
 where
     F: Future<Output = Result<(), E>>,
@@ -281,7 +288,7 @@
             Some(ack_result),
             reject_reason,
         );
-        acknowledged_probe_sequences.insert(sequence.to_string());
+        acknowledged_probe_sequences.insert((generation, sequence.to_string()));
         ControlledFixtureAckPublishOutcome {
             observed,
             published: true,
@@ -337,7 +344,7 @@
     let probe: ControlledFixtureAttributeProbe = serde_json::from_slice(payload).ok()?;
     if probe.message_type != CONTROLLED_FIXTURE_PROBE_TOPIC
         || probe.protocol_version != CONTROLLED_FIXTURE_PROTOCOL_VERSION
-        || probe.generation != CONTROLLED_FIXTURE_GENERATION
+        || !valid_input_generation(probe.generation)
         || probe.call_id_hash != sha256_hex(call_id)
         || probe.call_trace_id_hash != sha256_hex(trace_id)
         || probe.client_fixture_sequence.trim().is_empty()
@@ -356,6 +363,25 @@
     })
 }
 
+fn controlled_fixture_probe_binding_decision(
+    probe_sender: &str,
+    current_audio_participant: Option<&str>,
+    expected_participant: Option<&str>,
+) -> Result<(), &'static str> {
+    if !is_bound_user_participant(probe_sender, expected_participant) {
+        return Err("wrong_participant");
+    }
+    let Some(current_audio_participant) = current_audio_participant else {
+        return Err("no_current_participant");
+    };
+    if current_audio_participant != probe_sender
+        || !is_bound_user_participant(current_audio_participant, expected_participant)
+    {
+        return Err("wrong_participant");
+    }
+    Ok(())
+}
+
 fn controlled_fixture_visibility_bucket(elapsed: Duration) -> &'static str {
     if elapsed <= Duration::from_millis(250) {
         "lte_250ms"
@@ -368,48 +394,74 @@
     }
 }
 
-async fn observe_controlled_fixture_post_expiry<F>(
+async fn observe_controlled_fixture_post_expiry_views<F, G>(
     received_at: Instant,
     observation_deadline: Instant,
-    actual_participant: &str,
+    held_participant: &str,
     expected_participant: Option<&str>,
     requested_sequence: &str,
     lifecycle_active: Arc<AtomicBool>,
-    mut read_attributes: F,
+    mut read_held_attributes: F,
+    mut read_current_participant: G,
 ) -> Option<ControlledFixtureVisibilityEvidence>
 where
     F: FnMut() -> std::collections::HashMap<String, String>,
+    G: FnMut() -> Option<(String, std::collections::HashMap<String, String>)>,
 {
     loop {
         if !lifecycle_active.load(Ordering::Acquire) {
             return None;
         }
         let now = Instant::now();
-        let decision = classify_controlled_fixture_attributes(
-            actual_participant,
+        let held_decision = classify_controlled_fixture_attributes(
+            held_participant,
             expected_participant,
-            &read_attributes(),
+            &read_held_attributes(),
             requested_sequence,
         );
-        match decision {
+        match held_decision {
             Ok(()) => {
                 return Some(ControlledFixtureVisibilityEvidence {
                     first_visible_bucket: controlled_fixture_visibility_bucket(
                         now.saturating_duration_since(received_at),
                     ),
                     visibility_source: "participant_attributes_poll",
+                    visibility_result: "held_visible",
                     binding_matched: true,
                 });
             }
-            Err("missing_attributes") if now < observation_deadline => {}
-            Err("missing_attributes") => {
-                return Some(ControlledFixtureVisibilityEvidence {
-                    first_visible_bucket: "never_visible_within_observation_window",
-                    visibility_source: "participant_attributes_poll",
-                    binding_matched: true,
-                });
-            }
+            Err("missing_attributes") => {}
             Err(_) => return None,
+        }
+        let Some((current_identity, current_attributes)) = read_current_participant() else {
+            return None;
+        };
+        match classify_controlled_fixture_attributes(
+            &current_identity,
+            expected_participant,
+            &current_attributes,
+            requested_sequence,
+        ) {
+            Ok(()) => {
+                return Some(ControlledFixtureVisibilityEvidence {
+                    first_visible_bucket: controlled_fixture_visibility_bucket(
+                        now.saturating_duration_since(received_at),
+                    ),
+                    visibility_source: "current_room_lookup",
+                    visibility_result: "held_stale_current_visible",
+                    binding_matched: true,
+                });
+            }
+            Err("missing_attributes") => {}
+            Err(_) => return None,
+        }
+        if now >= observation_deadline {
+            return Some(ControlledFixtureVisibilityEvidence {
+                first_visible_bucket: "never_visible_within_observation_window",
+                visibility_source: "held_and_current_room_lookup",
+                visibility_result: "unavailable_both",
+                binding_matched: true,
+            });
         }
         sleep(CONTROLLED_FIXTURE_PROBE_RECHECK_DELAY).await;
     }
@@ -435,6 +487,7 @@
             "stage": "post_expiry_visibility",
             "first_visible_bucket": evidence.first_visible_bucket,
             "visibility_source": evidence.visibility_source,
+            "visibility_result": evidence.visibility_result,
             "binding_matched": evidence.binding_matched,
             "call_id_hash": probe.call_id_hash,
             "trace_id_hash": probe.call_trace_id_hash,
@@ -448,6 +501,7 @@
 fn spawn_controlled_fixture_post_expiry_observation(
     probe: PendingControlledFixtureProbe,
     participant: RemoteParticipant,
+    room: Arc<Room>,
     expected_participant: Option<String>,
     lifecycle_active: Arc<AtomicBool>,
     runtime_call_id: String,
@@ -455,7 +509,7 @@
 ) {
     tokio::spawn(async move {
         let participant_identity = participant.identity().to_string();
-        let evidence = observe_controlled_fixture_post_expiry(
+        let evidence = observe_controlled_fixture_post_expiry_views(
             probe.received_at,
             probe.received_at + CONTROLLED_FIXTURE_POST_EXPIRY_WINDOW,
             &participant_identity,
@@ -463,6 +517,11 @@
             &probe.sequence,
             lifecycle_active.clone(),
             || participant.attributes(),
+            || {
+                room.remote_participants()
+                    .get(&probe.sender)
+                    .map(|current| (current.identity().to_string(), current.attributes()))
+            },
         )
         .await;
         if lifecycle_active.load(Ordering::Acquire) {
@@ -512,6 +571,58 @@
         return Err("wrong_sequence");
     }
     Ok(())
+}
+
+fn controlled_fixture_probe_attribute_decision(
+    actual_participant: &str,
+    expected_participant: Option<&str>,
+    attributes: &std::collections::HashMap<String, String>,
+    probe: &PendingControlledFixtureProbe,
+) -> Result<(), &'static str> {
+    if !is_bound_user_participant(actual_participant, expected_participant) {
+        return Err("wrong_participant");
+    }
+    let metadata = match AudioIngressMetadata::from_participant(attributes) {
+        Ok(Some(metadata)) => metadata,
+        Ok(None) => return Err("missing_attributes"),
+        Err(reason) => return Err(reason),
+    };
+    if metadata.client_fixture_sequence != probe.sequence {
+        return Err("wrong_sequence");
+    }
+    if metadata.input_generation != probe.generation {
+        return Err("wrong_generation");
+    }
+    Ok(())
+}
+
+async fn observe_controlled_fixture_probe_attributes<F>(
+    expires_at: Instant,
+    actual_participant: &str,
+    expected_participant: Option<&str>,
+    probe: &PendingControlledFixtureProbe,
+    mut read_attributes: F,
+) -> Result<(), &'static str>
+where
+    F: FnMut() -> std::collections::HashMap<String, String>,
+{
+    loop {
+        if Instant::now() > expires_at {
+            return Err("timeout");
+        }
+        match controlled_fixture_probe_attribute_decision(
+            actual_participant,
+            expected_participant,
+            &read_attributes(),
+            probe,
+        ) {
+            Ok(()) => return Ok(()),
+            Err("missing_attributes") | Err("missing_generation") => {
+                sleep(CONTROLLED_FIXTURE_PROBE_RECHECK_DELAY).await;
+            }
+            Err(reason) => return Err(reason),
+        }
+    }
 }
 
 async fn observe_controlled_fixture_attributes<F>(
@@ -1248,6 +1359,10 @@
     expected.is_none_or(|value| identity == value)
 }
 
+fn valid_input_generation(generation: u64) -> bool {
+    generation > 0
+}
+
 async fn observe_user_audio_events(
     mut events: UnboundedReceiver<RoomEvent>,
     call_id: String,
@@ -1376,6 +1491,18 @@
                 }
                 current_user_participant = Some(participant_for_probe);
             }
+            RoomEvent::TrackUnsubscribed {
+                track: RemoteTrack::Audio(_),
+                publication: _,
+                participant,
+            } => {
+                if current_user_participant
+                    .as_ref()
+                    .is_some_and(|current| current.identity() == participant.identity())
+                {
+                    current_user_participant = None;
+                }
+            }
             RoomEvent::DataReceived {
                 payload,
                 topic: Some(topic),
@@ -1385,7 +1512,9 @@
                 if let Ok(probe) =
                     serde_json::from_slice::<ControlledFixtureAttributeProbe>(&payload)
                 {
-                    if acknowledged_probe_sequences.contains(&probe.client_fixture_sequence) {
+                    if acknowledged_probe_sequences
+                        .contains(&(probe.generation, probe.client_fixture_sequence.clone()))
+                    {
                         record_controlled_fixture_probe_event(
                             &call_id,
                             &trace_id,
@@ -1478,7 +1607,7 @@
 
 async fn process_controlled_fixture_probe(
     pending_probe: &mut Option<PendingControlledFixtureProbe>,
-    acknowledged_probe_sequences: &mut HashSet<String>,
+    acknowledged_probe_sequences: &mut HashSet<(u64, String)>,
     participant: Option<&RemoteParticipant>,
     sink: &BotAudioOutputSink,
     expected_participant: Option<&str>,
@@ -1489,7 +1618,7 @@
     let Some(probe) = pending_probe.take() else {
         return None;
     };
-    if acknowledged_probe_sequences.contains(&probe.sequence) {
+    if acknowledged_probe_sequences.contains(&(probe.generation, probe.sequence.clone())) {
         record_controlled_fixture_probe_event(
             runtime_call_id,
             runtime_trace_id,
@@ -1550,16 +1679,28 @@
         );
         return Some(false);
     }
-    let decision = observe_controlled_fixture_attributes(
+    let decision = observe_controlled_fixture_probe_attributes(
         probe.expires_at,
-        &participant.identity().to_string(),
+        participant.identity().as_str(),
         expected_participant,
-        &probe.sequence,
+        &probe,
         || participant.attributes(),
     )
     .await;
+    if let Err(reason) = decision {
+        record_controlled_fixture_attribute_decision(
+            Err(reason),
+            runtime_call_id,
+            runtime_trace_id,
+            &probe.call_id_hash,
+            &probe.call_trace_id_hash,
+            probe.generation,
+            &probe.sequence,
+        );
+        return Some(false);
+    }
     let (ack_result, reject_reason, observed) = record_controlled_fixture_attribute_decision(
-        decision,
+        Ok(()),
         runtime_call_id,
         runtime_trace_id,
         &probe.call_id_hash,
@@ -1609,6 +1750,7 @@
         spawn_controlled_fixture_post_expiry_observation(
             probe,
             participant.clone(),
+            sink.room.clone(),
             expected_participant.map(str::to_string),
             lifecycle_active,
             runtime_call_id.to_string(),
@@ -3767,6 +3909,7 @@
         };
         let mut realtime_asr_upload: Option<RealtimeAsrUpload> = None;
         let mut last_fixture_sequence: Option<String> = None;
+        let mut last_fixture_generation: Option<u64> = None;
 
         while let Some(drained) = frame_rx.recv().await {
             let frame = drained.frame;
@@ -3817,6 +3960,7 @@
                         || participant.attributes(),
                         &mut realtime_asr_upload,
                         &mut last_fixture_sequence,
+                        &mut last_fixture_generation,
                         turn_bridge_config.asr_realtime_enabled,
                     );
 
@@ -3953,6 +4097,7 @@
     read_attributes: F,
     upload_slot: &mut Option<RealtimeAsrUpload>,
     last_fixture_sequence: &mut Option<String>,
+    last_fixture_generation: &mut Option<u64>,
     realtime_enabled: bool,
 ) -> (bool, bool, Option<FinishedSpeechTurn>)
 where
@@ -3979,6 +4124,7 @@
             read_attributes,
             upload_slot,
             last_fixture_sequence,
+            last_fixture_generation,
             realtime_enabled,
         );
     }
@@ -4001,6 +4147,7 @@
     read_attributes: F,
     upload_slot: &mut Option<RealtimeAsrUpload>,
     last_fixture_sequence: &mut Option<String>,
+    last_fixture_generation: &mut Option<u64>,
     realtime_enabled: bool,
 ) -> (bool, bool, Option<FinishedSpeechTurn>)
 where
@@ -4027,6 +4174,7 @@
         read_attributes,
         upload_slot,
         last_fixture_sequence,
+        last_fixture_generation,
         realtime_enabled,
     )
 }
@@ -4040,6 +4188,7 @@
     read_attributes: impl FnOnce() -> std::collections::HashMap<String, String>,
     upload_slot: &mut Option<RealtimeAsrUpload>,
     last_fixture_sequence: &mut Option<String>,
+    last_fixture_generation: &mut Option<u64>,
     realtime_enabled: bool,
 ) {
     let turn_id = format!("turn-{:04}", vad.turn_index);
@@ -4057,9 +4206,11 @@
         }
     };
     if let Some(metadata) = metadata.as_ref() {
-        if !fixture_sequence_is_new(
+        if !fixture_binding_is_new(
             last_fixture_sequence.as_deref(),
+            *last_fixture_generation,
             &metadata.client_fixture_sequence,
+            metadata.input_generation,
         ) {
             warn!(call_id = %call_id, trace_id = %trace_id, turn_id = %turn_id,
                 audioIngressOriginStatus = "sequence_replayed_or_regressed",
@@ -4079,6 +4230,7 @@
         Ok(upload) => {
             if let Some(metadata) = metadata {
                 *last_fixture_sequence = Some(metadata.client_fixture_sequence);
+                *last_fixture_generation = Some(metadata.input_generation);
             }
             info!(call_id = %call_id, trace_id = %trace_id, turn_id = %turn_id,
                 origin_status, "runtime helper asr_realtime_session_started");
@@ -4106,6 +4258,23 @@
     match (previous_number, current_number) {
         (Some(previous), Some(current)) => current > previous,
         _ => previous != current,
+    }
+}
+
+fn fixture_binding_is_new(
+    previous_sequence: Option<&str>,
+    previous_generation: Option<u64>,
+    current_sequence: &str,
+    current_generation: u64,
+) -> bool {
+    if !valid_input_generation(current_generation) {
+        return false;
+    }
+    match previous_generation {
+        Some(previous) if current_generation < previous => false,
+        Some(previous) if current_generation > previous => true,
+        Some(_) => fixture_sequence_is_new(previous_sequence, current_sequence),
+        None => true,
     }
 }
 
@@ -4877,35 +5046,42 @@
 
     #[derive(Debug)]
     enum PreAudioOrderEvent {
-        DataReceived {
-            sender: String,
-            sequence: String,
-        },
-        TrackSubscribed {
-            participant: String,
-            attributes: HashMap<String, String>,
-        },
+        DataReceived { sender: String, sequence: String },
+        TrackSubscribed { participant: String },
     }
 
     fn drive_pre_audio_order_test_seam(events: &[PreAudioOrderEvent]) -> Vec<&'static str> {
-        let mut pending_sequence = None;
+        let call_id = "production-order-call";
+        let trace_id = "production-order-trace";
+        let mut pending_probe = None;
         let mut effects = Vec::new();
         for event in events {
             match event {
-                PreAudioOrderEvent::DataReceived { sender, sequence } if sender == "user-1" => {
-                    pending_sequence = Some(sequence.as_str());
+                PreAudioOrderEvent::DataReceived { sender, sequence } => {
+                    let payload = serde_json::to_vec(&json!({
+                        "type": CONTROLLED_FIXTURE_PROBE_TOPIC,
+                        "protocolVersion": CONTROLLED_FIXTURE_PROTOCOL_VERSION,
+                        "callIdHash": sha256_hex(call_id),
+                        "callTraceIdHash": sha256_hex(trace_id),
+                        "generation": CONTROLLED_FIXTURE_GENERATION,
+                        "clientFixtureSequence": sequence,
+                    }))
+                    .expect("production probe payload");
+                    pending_probe = controlled_fixture_probe(
+                        &payload,
+                        call_id,
+                        trace_id,
+                        &ParticipantIdentity(sender.clone()),
+                        Some("user-1"),
+                    );
                 }
-                PreAudioOrderEvent::TrackSubscribed {
-                    participant,
-                    attributes,
-                } => {
-                    let pending = pending_sequence.is_some();
-                    let probe_result = pending_sequence.map(|sequence| {
-                        classify_controlled_fixture_attributes(
-                            participant,
+                PreAudioOrderEvent::TrackSubscribed { participant } => {
+                    let pending = pending_probe.is_some();
+                    let probe_result = pending_probe.as_ref().map(|probe| {
+                        controlled_fixture_probe_binding_decision(
+                            probe.sender.as_str(),
+                            Some(participant),
                             Some("user-1"),
-                            attributes,
-                            sequence,
                         )
                         .is_ok()
                     });
@@ -4923,9 +5099,8 @@
                     if observer_started {
                         effects.push("observer_started");
                     }
-                    pending_sequence = None;
+                    pending_probe = None;
                 }
-                PreAudioOrderEvent::DataReceived { .. } => {}
             }
         }
         effects
@@ -4959,6 +5134,8 @@
                 "clientFixtureSequence".to_string(),
                 "fixture-01".to_string(),
             ),
+            ("inputGeneration".to_string(), "1".to_string()),
+            ("language".to_string(), "ja-JP".to_string()),
         ]);
         let mut starts = Vec::new();
         for (session_index, sequence) in [(1, "fixture-01"), (2, "fixture-02")] {
@@ -4984,6 +5161,7 @@
             let is_in_speech = vad.in_speech;
             assert!(!was_in_speech && is_in_speech);
             attributes.insert("clientFixtureSequence".to_string(), sequence.to_string());
+            attributes.insert("language".to_string(), "ja-JP".to_string());
             let metadata = AudioIngressMetadata::from_participant(&attributes)
                 .expect("valid participant attributes")
                 .expect("controlled fixture metadata");
@@ -4998,6 +5176,7 @@
             let session_json: serde_json::Value =
                 serde_json::from_slice(&session_line).expect("session start json");
             assert_eq!(sequence, session_json["clientFixtureSequence"]);
+            assert_eq!("ja-JP", session_json["language"]);
             starts.push(metadata.client_fixture_sequence);
             vad.reset_current_turn();
         }
@@ -5090,9 +5269,12 @@
                 "clientFixtureSequence".to_string(),
                 "fixture-01".to_string(),
             ),
+            ("inputGeneration".to_string(), "1".to_string()),
+            ("language".to_string(), "ja-JP".to_string()),
         ]);
         let mut upload = None;
         let mut last_fixture_sequence = None;
+        let mut last_fixture_generation = None;
         let config = RealtimeAsrConfig {
             enabled: true,
             url: Some(format!("http://{address}/runtime/asr/realtime")),
@@ -5116,6 +5298,7 @@
             || attrs.clone(),
             &mut upload,
             &mut last_fixture_sequence,
+            &mut last_fixture_generation,
             true,
         );
         assert!(!was && is && turn.is_none());
@@ -5126,6 +5309,8 @@
             "clientFixtureSequence".to_string(),
             "fixture-02".to_string(),
         );
+        attrs.insert("inputGeneration".to_string(), "2".to_string());
+        attrs.insert("language".to_string(), "zh-CN".to_string());
         let (was, is, turn) = observe_bound_participant_frame(
             "participant-user",
             Some("participant-user"),
@@ -5138,10 +5323,11 @@
             2_000,
             &frame,
             Client::new(),
-            config,
+            config.clone(),
             || attrs.clone(),
             &mut upload,
             &mut last_fixture_sequence,
+            &mut last_fixture_generation,
             true,
         );
         assert!(!was && is && turn.is_none());
@@ -5156,6 +5342,16 @@
             .expect("second session request");
         assert!(first_request.contains("\"clientFixtureSequence\":\"fixture-01\""));
         assert!(second_request.contains("\"clientFixtureSequence\":\"fixture-02\""));
+        assert!(first_request.contains("\"callId\":\"call-001\""));
+        assert!(first_request.contains("\"traceId\":\"trace-001\""));
+        assert!(second_request.contains("\"callId\":\"call-001\""));
+        assert!(second_request.contains("\"traceId\":\"trace-001\""));
+        assert!(first_request.contains("\"inputSourceCategory\":\"controlled_fixture\""));
+        assert!(second_request.contains("\"inputSourceCategory\":\"controlled_fixture\""));
+        assert!(first_request.contains("\"inputGeneration\":1"));
+        assert!(second_request.contains("\"inputGeneration\":2"));
+        assert!(first_request.contains("\"language\":\"ja-JP\""));
+        assert!(second_request.contains("\"language\":\"zh-CN\""));
         assert!(
             first_request.contains("\"audioIngressOriginStatus\":\"controlled_fixture_bound\"")
         );
@@ -5172,6 +5368,32 @@
         attrs.insert(
             "clientFixtureSequence".to_string(),
             "fixture-03".to_string(),
+        );
+        attrs.insert("inputGeneration".to_string(), "1".to_string());
+        let (_, is_old_generation, old_generation_turn) = observe_bound_participant_frame(
+            "participant-user",
+            Some("participant-user"),
+            &mut vad,
+            "call-001",
+            "trace-001",
+            "participant-user",
+            "track-001",
+            3,
+            3_000,
+            &frame,
+            Client::new(),
+            config.clone(),
+            || attrs.clone(),
+            &mut upload,
+            &mut last_fixture_sequence,
+            &mut last_fixture_generation,
+            true,
+        );
+        assert!(is_old_generation && old_generation_turn.is_none() && upload.is_none());
+        vad.reset_current_turn();
+        attrs.insert(
+            "clientFixtureSequence".to_string(),
+            "fixture-04".to_string(),
         );
         let (_, is_wrong, wrong_turn) = observe_bound_participant_frame(
             "participant-other",
@@ -5195,6 +5417,7 @@
             || attrs.clone(),
             &mut upload,
             &mut last_fixture_sequence,
+            &mut last_fixture_generation,
             true,
         );
         assert!(!is_wrong && wrong_turn.is_none() && upload.is_none());
@@ -5225,6 +5448,7 @@
             || attrs.clone(),
             &mut upload,
             &mut last_fixture_sequence,
+            &mut last_fixture_generation,
             true,
         );
         assert!(upload.is_none());
@@ -5251,6 +5475,7 @@
             || attrs.clone(),
             &mut upload,
             &mut last_fixture_sequence,
+            &mut last_fixture_generation,
             true,
         );
         assert!(upload.is_none());
@@ -5278,6 +5503,7 @@
             || attrs.clone(),
             &mut upload,
             &mut last_fixture_sequence,
+            &mut last_fixture_generation,
             true,
         );
         assert!(missing_sequence_turn.is_none() && upload.is_none());
@@ -5311,6 +5537,7 @@
             || attrs,
             &mut invalid_upload,
             &mut last_fixture_sequence,
+            &mut last_fixture_generation,
             true,
         );
         assert!(invalid_turn.is_none());
@@ -5753,7 +5980,7 @@
                 published: true,
             }
         );
-        assert!(acknowledged.contains("fixture-02"));
+        assert!(acknowledged.contains(&(CONTROLLED_FIXTURE_GENERATION, "fixture-02".to_string())));
         assert_eq!(successful_observer_starts, 1);
     }
 
@@ -5787,6 +6014,49 @@
         .await;
         assert_eq!(result, Ok(()));
         assert_eq!(reads, 4);
+    }
+
+    #[tokio::test]
+    async fn production_probe_waits_for_generation_attribute_before_binding() {
+        let received_at = Instant::now();
+        let probe = PendingControlledFixtureProbe {
+            sender: ParticipantIdentity("user-1".to_string()),
+            call_id_hash: "call-hash".to_string(),
+            call_trace_id_hash: "trace-hash".to_string(),
+            generation: 2,
+            sequence: "fixture-02".to_string(),
+            received_at,
+            expires_at: received_at + CONTROLLED_FIXTURE_PROBE_TTL,
+        };
+        let expected = HashMap::from([
+            (
+                "inputSourceCategory".to_string(),
+                "controlled_fixture".to_string(),
+            ),
+            (
+                "clientFixtureSequence".to_string(),
+                "fixture-02".to_string(),
+            ),
+            ("inputGeneration".to_string(), "2".to_string()),
+        ]);
+        let mut reads = 0;
+        let result = observe_controlled_fixture_probe_attributes(
+            probe.expires_at,
+            "user-1",
+            Some("user-1"),
+            &probe,
+            || {
+                reads += 1;
+                if reads == 1 {
+                    HashMap::new()
+                } else {
+                    expected.clone()
+                }
+            },
+        )
+        .await;
+        assert_eq!(result, Ok(()));
+        assert_eq!(reads, 2);
     }
 
     #[tokio::test]
@@ -5855,7 +6125,7 @@
                 published: true,
             }
         );
-        let evidence = observe_controlled_fixture_post_expiry(
+        let evidence = observe_controlled_fixture_post_expiry_views(
             started_at,
             started_at + CONTROLLED_FIXTURE_POST_EXPIRY_WINDOW,
             "user-1",
@@ -5869,6 +6139,7 @@
                     HashMap::new()
                 }
             },
+            || Some(("user-1".to_string(), HashMap::new())),
         )
         .await;
         assert_eq!(acknowledged.len(), 1);
@@ -5877,13 +6148,14 @@
             Some(ControlledFixtureVisibilityEvidence {
                 first_visible_bucket: "250_500ms",
                 visibility_source: "participant_attributes_poll",
+                visibility_result: "held_visible",
                 binding_matched: true,
             })
         );
 
         let never_started_at = Instant::now();
         assert_eq!(
-            observe_controlled_fixture_post_expiry(
+            observe_controlled_fixture_post_expiry_views(
                 never_started_at,
                 never_started_at + Duration::from_millis(40),
                 "user-1",
@@ -5891,17 +6163,19 @@
                 "fixture-01",
                 Arc::new(AtomicBool::new(true)),
                 HashMap::new,
+                || Some(("user-1".to_string(), HashMap::new())),
             )
             .await,
             Some(ControlledFixtureVisibilityEvidence {
                 first_visible_bucket: "never_visible_within_observation_window",
-                visibility_source: "participant_attributes_poll",
+                visibility_source: "held_and_current_room_lookup",
+                visibility_result: "unavailable_both",
                 binding_matched: true,
             })
         );
 
         assert_eq!(
-            observe_controlled_fixture_post_expiry(
+            observe_controlled_fixture_post_expiry_views(
                 Instant::now(),
                 Instant::now() + Duration::from_millis(50),
                 "cross-call-user",
@@ -5909,6 +6183,7 @@
                 "fixture-01",
                 Arc::new(AtomicBool::new(true)),
                 || expected.clone(),
+                || Some(("user-1".to_string(), expected.clone())),
             )
             .await,
             None
@@ -5916,7 +6191,7 @@
 
         let inactive = Arc::new(AtomicBool::new(false));
         assert_eq!(
-            observe_controlled_fixture_post_expiry(
+            observe_controlled_fixture_post_expiry_views(
                 Instant::now(),
                 Instant::now() + Duration::from_millis(50),
                 "user-1",
@@ -5924,6 +6199,7 @@
                 "fixture-01",
                 inactive,
                 HashMap::new,
+                || Some(("user-1".to_string(), HashMap::new())),
             )
             .await,
             None
@@ -5959,6 +6235,7 @@
                 "sequence_hash",
                 "stage",
                 "trace_id_hash",
+                "visibility_result",
                 "visibility_source",
             ]
         );
@@ -5971,6 +6248,105 @@
             "\"audio\":",
         ] {
             assert!(!encoded.contains(forbidden));
+        }
+    }
+
+    #[tokio::test]
+    async fn production_post_expiry_observation_distinguishes_held_stale_from_current_room_view() {
+        let started_at = Instant::now();
+        let current_attributes = HashMap::from([
+            (
+                "inputSourceCategory".to_string(),
+                "controlled_fixture".to_string(),
+            ),
+            (
+                "clientFixtureSequence".to_string(),
+                "fixture-01".to_string(),
+            ),
+        ]);
+        let mut acknowledged = HashSet::new();
+        let expired_ack = complete_controlled_fixture_ack_publish(
+            async { Ok::<(), ()>(()) },
+            "runtime-call-current-view",
+            "runtime-trace-current-view",
+            false,
+            "timeout",
+            Some("expired"),
+            "call-current-view",
+            "trace-current-view",
+            CONTROLLED_FIXTURE_GENERATION,
+            "fixture-01",
+            &mut acknowledged,
+        )
+        .await;
+        let evidence = observe_controlled_fixture_post_expiry_views(
+            started_at,
+            started_at + Duration::from_millis(100),
+            "user-1",
+            Some("user-1"),
+            "fixture-01",
+            Arc::new(AtomicBool::new(true)),
+            HashMap::new,
+            || Some(("user-1".to_string(), current_attributes.clone())),
+        )
+        .await;
+
+        assert_eq!(
+            expired_ack,
+            ControlledFixtureAckPublishOutcome {
+                observed: false,
+                published: true,
+            }
+        );
+        assert_eq!(acknowledged.len(), 1);
+        assert_eq!(
+            evidence,
+            Some(ControlledFixtureVisibilityEvidence {
+                first_visible_bucket: "lte_250ms",
+                visibility_source: "current_room_lookup",
+                visibility_result: "held_stale_current_visible",
+                binding_matched: true,
+            })
+        );
+        let mut observer_starts = 0;
+        assert!(!start_observer_after_controlled_fixture_probe(
+            true,
+            Some(expired_ack.observed),
+            || observer_starts += 1,
+        ));
+        assert_eq!(observer_starts, 0);
+
+        for current_view in [
+            None,
+            Some(("cross-call-user".to_string(), current_attributes.clone())),
+            Some((
+                "user-1".to_string(),
+                HashMap::from([
+                    (
+                        "inputSourceCategory".to_string(),
+                        "controlled_fixture".to_string(),
+                    ),
+                    (
+                        "clientFixtureSequence".to_string(),
+                        "fixture-old".to_string(),
+                    ),
+                ]),
+            )),
+        ] {
+            assert_eq!(
+                observe_controlled_fixture_post_expiry_views(
+                    Instant::now(),
+                    Instant::now() + Duration::from_millis(20),
+                    "user-1",
+                    Some("user-1"),
+                    "fixture-01",
+                    Arc::new(AtomicBool::new(true)),
+                    HashMap::new,
+                    || current_view.clone(),
+                )
+                .await,
+                None
+            );
         }
     }
 
@@ -6033,24 +6409,13 @@
 
     #[test]
     fn production_event_order_probe_then_track_publishes_ack_before_observer() {
-        let attributes = HashMap::from([
-            (
-                "inputSourceCategory".to_string(),
-                "controlled_fixture".to_string(),
-            ),
-            (
-                "clientFixtureSequence".to_string(),
-                "fixture-01".to_string(),
-            ),
-        ]);
         let effects = drive_pre_audio_order_test_seam(&[
             PreAudioOrderEvent::DataReceived {
                 sender: "user-1".to_string(),
-                sequence: "fixture-01".to_string(),
+                sequence: "1".to_string(),
             },
             PreAudioOrderEvent::TrackSubscribed {
                 participant: "user-1".to_string(),
-                attributes,
             },
         ]);
         assert_eq!(effects, ["ack_observed", "observer_started"]);
@@ -6058,19 +6423,13 @@
 
     #[test]
     fn production_event_order_negative_probe_has_no_observer_or_session_effect() {
-        let mut invalid = HashMap::new();
-        invalid.insert(
-            "inputSourceCategory".to_string(),
-            "ordinary_mic".to_string(),
-        );
         let effects = drive_pre_audio_order_test_seam(&[
             PreAudioOrderEvent::DataReceived {
                 sender: "user-1".to_string(),
-                sequence: "fixture-01".to_string(),
+                sequence: "1".to_string(),
             },
             PreAudioOrderEvent::TrackSubscribed {
-                participant: "user-1".to_string(),
-                attributes: invalid,
+                participant: "cross-call-user".to_string(),
             },
         ]);
         assert!(effects.is_empty());

--
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