Platform SCP03 セッション統合とテスト改善

- Session に SCP03 コンテキストを統合 (se050_session_scp03_* API)
- PlatformSCP03 認証フロー実装
- テストを再記述 (42/42 パス)
- API ドキュメント更新
- ビルドシステム改善

include/se050_wireguard.h

@@ -165,6 +165,54 @@ void se050_session_close(se050_session_ctx_t *ctx);
  */
 void se050_session_delete(se050_session_ctx_t *ctx);
 
+/* ============================================================================
+ * Session SCP03 Integration
+ * ============================================================================ */
+
+/**
+ * @brief Initialize SCP03 secure channel for session
+ * @param ctx Session context
+ * @return SE050_OK on success
+ */
+se050_status_t se050_session_scp03_init(se050_session_ctx_t *ctx);
+
+/**
+ * @brief Set SCP03 keys for PlatformSCP03 authentication
+ * @param ctx Session context
+ * @param enc_key Encryption key (16 bytes)
+ * @param mac_key MAC key (16 bytes)
+ * @param dek_key Data Encryption Key (16 bytes)
+ * @return SE050_OK on success
+ */
+se050_status_t se050_session_scp03_set_keys(se050_session_ctx_t *ctx,
+                                             const uint8_t *enc_key,
+                                             const uint8_t *mac_key,
+                                             const uint8_t *dek_key);
+
+/**
+ * @brief Encrypt command using SCP03
+ * @param ctx Session context
+ * @param cmd Command buffer
+ * @param cmd_len Command length (updated after padding)
+ * @return SE050_OK on success
+ */
+se050_status_t se050_session_scp03_encrypt(se050_session_ctx_t *ctx,
+                                            uint8_t *cmd,
+                                            size_t *cmd_len);
+
+/**
+ * @brief Decrypt response using SCP03
+ * @param ctx Session context
+ * @param cmd_len Original command length
+ * @param rsp Response buffer
+ * @param rsp_len Response length (updated after decryption)
+ * @return Status word (0x9000 on success)
+ */
+uint16_t se050_session_scp03_decrypt(se050_session_ctx_t *ctx,
+                                      size_t cmd_len,
+                                      uint8_t *rsp,
+                                      size_t *rsp_len);
+
 /* ============================================================================
  * Key Store
  * ============================================================================ */