refactor: prefix private data members with m_

Rename all trailing-underscore private data members to the m_ prefix
required by AGENTS.md, across the auth, crypto, gip, mt76, and usb
transport classes plus the app session classes. Pure rename; no
behavior change. Full build and test suite pass.

Co-Authored-By: qwen3.8-27b@q3_k_xl: renamed members to m_ prefix

include/auth/auth.hpp

@@ -79,15 +79,15 @@ private:
     auto handle_pubkey(std::span<u8 const> data) -> int;
     auto get_transcript() -> std::array<u8, k_transcript_len>;
 
-    auth_sink& sink_;
-    sha256 transcript_;
-    u8 last_sent_command_ = 0;
+    auth_sink& m_sink;
+    sha256 m_transcript;
+    u8 m_last_sent_command = 0;
 
-    std::array<u8, k_random_len> random_host_{};
-    std::array<u8, k_random_len> random_client_{};
-    std::array<u8, k_pubkey_len> pubkey_client_{};
-    std::array<u8, k_pubkey2_len> pubkey_client2_{};
-    std::array<u8, k_secret_len> master_secret_{};
+    std::array<u8, k_random_len> m_random_host{};
+    std::array<u8, k_random_len> m_random_client{};
+    std::array<u8, k_pubkey_len> m_pubkey_client{};
+    std::array<u8, k_pubkey2_len> m_pubkey_client2{};
+    std::array<u8, k_secret_len> m_master_secret{};
 
     enum class deferred_action {
         none,
@@ -95,7 +95,7 @@ private:
         exchange_ecdh,
         complete,
     };
-    deferred_action deferred_action_ = deferred_action::none;
+    deferred_action m_deferred_action = deferred_action::none;
 };
 
 } // namespace xone::auth

include/auth/crypto.hpp

@@ -48,7 +48,7 @@ public:
     auto finalize(std::array<u8, k_sha256_len>& out) -> void;
 
 private:
-    CC_SHA256_CTX ctx_;
+    CC_SHA256_CTX m_ctx;
 };
 
 // --------------------------------------------------------------------------
@@ -62,8 +62,8 @@ public:
     auto finalize(std::array<u8, k_sha256_len>& out) -> void;
 
 private:
-    sha256 inner_;
-    sha256 outer_;
+    sha256 m_inner;
+    sha256 m_outer;
 };
 
 // --------------------------------------------------------------------------