fix: revert config-dependent cargo-fix changes (kept only always-safe edits)

cargo fix ran under --no-default-features and removed an import/mut that are
'unused' ONLY in the minimal build but genuinely USED in CI's full build
(error[E0596]: cannot borrow result as mutable in desktop discovery.rs). Those
are false-positive warnings in the minimal config. Reverted bridge.rs/
commissioning.rs/discovery.rs to origin/main; kept the always-safe edits
(dead-code #[allow] notes + ClockGateDecision doc fields + camera macOS-only
allow). Full-features build of all four crates: Finished, 0 errors.

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 result = Vec::new();
+    let mut result = Vec::new();
 
     // List /dev/cu.usb* devices on macOS
     #[cfg(target_os = "macos")]

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

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

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`.
 
- // re-export-only guard
+use super::super::matter::clusters::VENDOR_ATTR_PERSON_COUNT as _; // re-export-only guard
 
 /// Inputs to setup-code generation. `passcode` and `discriminator`
 /// are usually random at first start and persisted in the