chore(v2): zero-warnings hygiene — clear 13 build warnings across 4 crates

Removed unused Matter imports (sensing-server bridge/commissioning), dropped
needless mut (bridge, desktop discovery), documented ClockGateDecision variant
fields (ruvector coherence), and marked deferred-P2/platform-only helpers
#[allow(dead_code)] with honest notes (entity_on_matter/next_endpoint =
Matter-publisher API deferred per ADR-159 §A5; decode_jpeg_to_rgb = macOS-only).
Behavior-neutral; touched-crate tests green. Remaining 1 warning is a benign
Windows .pdb filename collision inherent to the Tauri lib+bin desktop crate
(renaming the bin would break Tauri bundling — won't-fix for a cosmetic warning).

Co-Authored-By: claude-flow <ruv@ruv.net>

v2/crates/wifi-densepose-desktop/src/commands/discovery.rs

@@ -355,7 +355,7 @@ pub async fn list_serial_ports() -> Result<Vec<SerialPortInfo>, String> {
 fn list_serial_ports_fallback() -> Result<Vec<SerialPortInfo>, String> {
     tracing::info!("Using fallback serial port listing");
 
-    let mut result = Vec::new();
+    let result = Vec::new();
 
     // List /dev/cu.usb* devices on macOS
     #[cfg(target_os = "macos")]

v2/crates/wifi-densepose-pointcloud/src/camera.rs

@@ -188,6 +188,8 @@ Thread.sleep(forTimeInterval: 3)"#,
     bail!("macOS camera capture requires GUI session with camera permission")
 }
 
+// Used only by the macOS capture path above; dead on other targets.
+#[allow(dead_code)]
 fn decode_jpeg_to_rgb(path: &PathBuf, _width: u32, _height: u32) -> Result<Frame> {
     let data = std::fs::read(path)?;
     let _ = std::fs::remove_file(path);

v2/crates/wifi-densepose-ruvector/src/viewpoint/coherence.rs

@@ -261,9 +261,15 @@ pub enum ClockGateDecision {
     /// Both terms pass: node admitted at full weight.
     Admit,
     /// Phase OK but clock degraded: evidence-only, NO environment/model update.
-    MonitorOnly { clock_quality: f32 },
+    MonitorOnly {
+        /// Combined clock-quality score in [0, 1] (dispersion × age terms).
+        clock_quality: f32,
+    },
     /// Either term fails hard: node excluded this cycle.
-    Reject { reason: ClockRejectReason },
+    Reject {
+        /// Which hard term failed (phase, dispersion, or age).
+        reason: ClockRejectReason,
+    },
 }
 
 /// Clock-quality gate: combines the phase [`CoherenceGate`] with clock

v2/crates/wifi-densepose-sensing-server/src/matter/bridge.rs

@@ -23,8 +23,7 @@
 use crate::mqtt::discovery::EntityKind;
 
 use super::clusters::{
-    matter_mapping, MatterClusterMapping, DEVICE_TYPE_AGGREGATOR,
-    DEVICE_TYPE_BRIDGED_NODE,
+    matter_mapping, DEVICE_TYPE_AGGREGATOR,
 };
 
 /// One endpoint on the Matter device tree.
@@ -107,7 +106,7 @@ pub fn build_bridge_tree(nodes: &[(String, String, Vec<EntityKind>)]) -> BridgeT
 
             let ep_id = next_endpoint;
             next_endpoint += 1;
-            let mut ep = Endpoint {
+            let ep = Endpoint {
                 endpoint_id: ep_id,
                 device_type: m.device_type,
                 label: format!("{:?}", entity),

v2/crates/wifi-densepose-sensing-server/src/matter/clusters.rs

@@ -145,6 +145,8 @@ pub fn matter_mapping(entity: EntityKind) -> Option<MatterClusterMapping> {
 }
 
 /// True iff the entity has a Matter exposure on a current spec cluster.
+// P2 Matter-publisher API surface; real Matter exposure is deferred (ADR-159 §A5).
+#[allow(dead_code)]
 pub fn entity_on_matter(entity: EntityKind) -> bool {
     matter_mapping(entity).is_some()
 }
@@ -152,6 +154,8 @@ pub fn entity_on_matter(entity: EntityKind) -> bool {
 /// Compute the next available endpoint ID for a node-scoped entity,
 /// given a starting offset (the bridge's first child endpoint). Used
 /// by the publisher to assign per-primitive endpoints deterministically.
+// P2 Matter-publisher API surface; real Matter exposure is deferred (ADR-159 §A5).
+#[allow(dead_code)]
 pub fn next_endpoint(base: u16, primitive_index: u16) -> u16 {
     base.saturating_add(primitive_index)
 }

v2/crates/wifi-densepose-sensing-server/src/matter/commissioning.rs

@@ -40,7 +40,7 @@
 //! vector `(passcode=20202021, discriminator=3840)` encodes to the
 //! Matter-published `34970112332`.
 
-use super::super::matter::clusters::VENDOR_ATTR_PERSON_COUNT as _; // re-export-only guard
+ // re-export-only guard
 
 /// Inputs to setup-code generation. `passcode` and `discriminator`
 /// are usually random at first start and persisted in the