test(lesavka): repair HEVC guard contract harness

Cargo.lock

@@ -1749,6 +1749,7 @@ dependencies = [
  "gstreamer-app",
  "gstreamer-video",
  "gtk4",
+ "jpeg-decoder",
  "lesavka_client",
  "lesavka_common",
  "lesavka_server",

Cargo.toml

@@ -44,6 +44,7 @@ gstreamer = { version = "0.23", features = ["v1_22"] }
 gstreamer-app = { version = "0.23", features = ["v1_22"] }
 gstreamer-video = { version = "0.23", features = ["v1_22"] }
 gtk = { version = "0.8", package = "gtk4", features = ["v4_6"] }
+jpeg-decoder = { version = "0.3", default-features = false }
 winit = "0.30"
 serial_test = { workspace = true }
 serde = { version = "1.0", features = ["derive"] }

scripts/ci/hygiene_gate_baseline.json

@@ -1308,17 +1308,22 @@
     "server/src/video_sinks/hevc_mjpeg_guard.rs": {
       "clippy_warnings": 0,
       "doc_debt": 0,
-      "loc": 375
+      "loc": 383
     },
     "server/src/video_sinks/hevc_mjpeg_guard/mjpeg_frame_inspection.rs": {
       "clippy_warnings": 0,
       "doc_debt": 1,
       "loc": 167
     },
+    "server/src/video_sinks/hevc_mjpeg_guard/mjpeg_visual_guard.rs": {
+      "clippy_warnings": 0,
+      "doc_debt": 8,
+      "loc": 475
+    },
     "server/src/video_sinks/hevc_mjpeg_guard/tests.rs": {
       "clippy_warnings": 0,
-      "doc_debt": 5,
-      "loc": 258
+      "doc_debt": 11,
+      "loc": 422
     },
     "server/src/video_sinks/mjpeg_spool.rs": {
       "clippy_warnings": 0,

tests/chaos/server/video_sinks/hevc_mjpeg_guard_chaos_contract.rs

@@ -15,8 +15,9 @@ mod video_support {
     }
 }
 
+mod video_sinks {
     #[allow(clippy::items_after_test_module)]
-mod guard {
+    pub mod hevc_mjpeg_guard {
         include!(concat!(
             env!("CARGO_MANIFEST_DIR"),
             "/server/src/video_sinks/hevc_mjpeg_guard.rs"
@@ -42,6 +43,8 @@ mod guard {
             direct_mjpeg_reject_reason(previous_bytes, Some(max_bytes), None, mjpeg).is_some()
         }
     }
+}
+use video_sinks::hevc_mjpeg_guard as guard;
 
 const WEBCAM_SINK: &str = include_str!(concat!(
     env!("CARGO_MANIFEST_DIR"),

tests/contract/server/video_sinks/server_video_sinks_include_contract.rs

@@ -20,7 +20,7 @@ mod video_support {
 mod media_timing;
 
 #[allow(warnings)]
-mod video_sinks_include_contract {
+mod video_sinks {
     include!(env!("LESAVKA_SERVER_VIDEO_SINKS_SRC"));
 
     use crate::camera::{CameraOutput, HdmiConnector, HdmiMode};

tests/regression/server/video_sinks/server_mjpeg_normalizer_memory_regression.rs

@@ -18,8 +18,9 @@ mod video_support {
     }
 }
 
+mod video_sinks {
     #[allow(clippy::items_after_test_module)]
-mod guard {
+    pub mod hevc_mjpeg_guard {
         include!(concat!(
             env!("CARGO_MANIFEST_DIR"),
             "/server/src/video_sinks/hevc_mjpeg_guard.rs"
@@ -33,6 +34,8 @@ mod guard {
             direct_mjpeg_normalize_rss_limit_kb()
         }
     }
+}
+use video_sinks::hevc_mjpeg_guard as guard;
 
 const SERVER_INSTALL: &str = include_str!(concat!(
     env!("CARGO_MANIFEST_DIR"),

tests/unit/server/video_sinks/hevc_mjpeg_guard_unit.rs

@@ -16,8 +16,9 @@ mod video_support {
     }
 }
 
+mod video_sinks {
     #[allow(clippy::items_after_test_module)]
-mod guard {
+    pub mod hevc_mjpeg_guard {
         include!(concat!(
             env!("CARGO_MANIFEST_DIR"),
             "/server/src/video_sinks/hevc_mjpeg_guard.rs"
@@ -43,6 +44,8 @@ mod guard {
             should_freeze_decoded_mjpeg_frame(previous_bytes, decoded_mjpeg)
         }
     }
+}
+use video_sinks::hevc_mjpeg_guard as guard;
 
 #[derive(Default)]
 struct GuardedFrameEmitter {