media: preserve bounded audio uplink continuity

AGENTS.md

@@ -286,3 +286,15 @@ Context: 0.17.10 installed cleanly on both ends (`4bb0f4a`) and produced a high-
 - [x] Update operational docs and installer contract tests for the new baseline.
 - [x] Run focused calibration, installer, and runtime checks.
 - [x] Push clean semver `0.17.11` for installed client/server testing.
+
+## 0.17.12 Sync-Only Audio Marker Continuity Checklist
+
+Context: 0.17.11 installed cleanly on both ends (`092c03a`) and fixed the constant browser-visible offset: raw activity start was `-17.0ms`, median coded skew was `+13.1ms`, and no server planner freeze/drop counters moved. The run still failed because only 5 coded pairs were usable and the last two had weak confidence (`0.58`, `0.33`) while the client log showed repeated microphone stale/superseded drops. The remaining sync blocker is audio-marker continuity, not another constant offset.
+
+- [x] Keep 0.17.12 scoped to sync establishment; do not change video freshness or server freshness ceilings.
+- [x] Stop using latest-only policy for microphone uplink packets; preserve oldest fresh audio chunks so speech/pulses stay continuous.
+- [x] Keep microphone queue age bounded at `400ms` so continuity does not become unbounded backlog.
+- [x] Apply the same bounded audio-continuity policy to the synthetic sync-probe audio queue.
+- [x] Update contract tests to encode the new audio continuity policy.
+- [x] Run focused client queue/probe contracts and package checks.
+- [ ] Push clean semver `0.17.12` for installed client/server testing.

Cargo.lock

@@ -1652,7 +1652,7 @@ checksum = "09edd9e8b54e49e587e4f6295a7d29c3ea94d469cb40ab8ca70b288248a81db2"
 
 [[package]]
 name = "lesavka_client"
-version = "0.17.11"
+version = "0.17.12"
 dependencies = [
  "anyhow",
  "async-stream",
@@ -1686,7 +1686,7 @@ dependencies = [
 
 [[package]]
 name = "lesavka_common"
-version = "0.17.11"
+version = "0.17.12"
 dependencies = [
  "anyhow",
  "base64",
@@ -1698,7 +1698,7 @@ dependencies = [
 
 [[package]]
 name = "lesavka_server"
-version = "0.17.11"
+version = "0.17.12"
 dependencies = [
  "anyhow",
  "base64",

client/Cargo.toml

@@ -4,7 +4,7 @@ path                    = "src/main.rs"
 
 [package]
 name                    = "lesavka_client"
-version                 = "0.17.11"
+version                 = "0.17.12"
 edition                 = "2024"
 
 [dependencies]

client/src/app/uplink_media.rs

@@ -423,9 +423,9 @@ const VIDEO_UPLINK_QUEUE: crate::uplink_fresh_queue::FreshQueueConfig =
 #[cfg(not(coverage))]
 const AUDIO_UPLINK_QUEUE: crate::uplink_fresh_queue::FreshQueueConfig =
     crate::uplink_fresh_queue::FreshQueueConfig {
-        capacity: 16,
+        capacity: 64,
         max_age: Duration::from_millis(400),
-        policy: crate::uplink_fresh_queue::FreshQueuePolicy::LatestOnly,
+        policy: crate::uplink_fresh_queue::FreshQueuePolicy::DrainOldest,
     };
 
 #[cfg(not(coverage))]

client/src/sync_probe/capture.rs

@@ -50,9 +50,9 @@ const PROBE_VIDEO_QUEUE: FreshQueueConfig = FreshQueueConfig {
 
 #[cfg(any(not(coverage), test))]
 const PROBE_AUDIO_QUEUE: FreshQueueConfig = FreshQueueConfig {
-    capacity: 32,
+    capacity: 64,
     max_age: Duration::from_millis(400),
-    policy: crate::uplink_fresh_queue::FreshQueuePolicy::LatestOnly,
+    policy: crate::uplink_fresh_queue::FreshQueuePolicy::DrainOldest,
 };
 
 #[cfg(any(not(coverage), test))]

common/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name                    = "lesavka_common"
-version                 = "0.17.11"
+version                 = "0.17.12"
 edition                 = "2024"
 build                   = "build.rs"
 

server/Cargo.toml

@@ -10,7 +10,7 @@ bench                   = false
 
 [package]
 name                    = "lesavka_server"
-version                 = "0.17.11"
+version                 = "0.17.12"
 edition                 = "2024"
 autobins                = false
 

testing/tests/client_uplink_freshness_contract.rs

@@ -82,7 +82,12 @@ fn microphone_uplink_queue_freshness_budget_stays_within_live_audio_window() {
         max_age_ms <= 400,
         "AUDIO_UPLINK_QUEUE max_age is {max_age_ms}ms; keep it <= 400ms for live calls"
     );
-    assert_queue_policy(block, "AUDIO_UPLINK_QUEUE", "LatestOnly");
+    assert_queue_policy(block, "AUDIO_UPLINK_QUEUE", "DrainOldest");
+    let capacity = parse_queue_capacity(block, "AUDIO_UPLINK_QUEUE");
+    assert!(
+        capacity <= 64,
+        "AUDIO_UPLINK_QUEUE capacity is {capacity}; keep audio continuity bounded"
+    );
 }
 
 #[test]
@@ -107,12 +112,12 @@ fn sync_probe_video_queue_uses_same_freshness_budget() {
 }
 
 #[test]
-fn sync_probe_audio_queue_uses_live_latest_only_policy() {
+fn sync_probe_audio_queue_preserves_bounded_marker_continuity() {
     let block = queue_block(SYNC_PROBE_CAPTURE_SRC, "PROBE_AUDIO_QUEUE");
     let max_age_ms = parse_queue_max_age_ms(block, "PROBE_AUDIO_QUEUE");
     assert!(
         max_age_ms <= 400,
-        "PROBE_AUDIO_QUEUE max_age is {max_age_ms}ms; keep probe audio from preserving stale timing anchors"
+        "PROBE_AUDIO_QUEUE max_age is {max_age_ms}ms; keep probe audio continuity bounded"
     );
-    assert_queue_policy(block, "PROBE_AUDIO_QUEUE", "LatestOnly");
+    assert_queue_policy(block, "PROBE_AUDIO_QUEUE", "DrainOldest");
 }