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* Add Mbed TLS 4.x support (PSA Crypto) for macOS Auto-detect Mbed TLS 4.x via MBEDTLS_VERSION_MAJOR and adapt the backend: - Include psa/crypto.h and drop the headers removed in 4.x (ctr_drbg, entropy, md5, sha*), gated behind the version macro. - Compute MD5/SHA-256/SHA-512 via PSA (psa_hash_compute) and initialize PSA Crypto once with std::call_once. - Drop the explicit entropy/CTR-DRBG RNG (PSA provides the TLS RNG) and skip the RNG-callback overloads of pk_parse_key/pk_check_pair on 4.x. - Retry on a TLS 1.3 NewSessionTicket (the 4.x default) in connect, read, write and is_peer_closed via a single mbedtls_is_session_ticket() helper, so online HTTPS works, including large redirected downloads where the ticket arrives mid-write. Note V4 implies V3, so 3.x-only paths now check V3 && !V4. Build systems (macOS): the CMake config and pkg-config shipped by Homebrew resolve 4.x transitively, so CMakeLists.txt and meson.build need no change for linking; the Makefile links libtfpsacrypto when present, else libmbedcrypto. Tests: generate the encrypted client key as both PBES2-AES (3.6+/4.x, OpenSSL, wolfSSL) and PBES1-3DES (Mbed TLS 2.28) and pick by version, since 4.x dropped DES and 2.28 lacks PBES2. Also generate the IP-host certs in test/meson.build to match gen-certs.sh and CMakeLists.txt. * CI: test Mbed TLS 4.x on macOS, 3.x on Ubuntu 26.04 Homebrew's default mbedtls is now 4.x, so switch the macOS build and CI job to it (drop the mbedtls@3 pin). That leaves 3.x (Ubuntu 24.04 apt ships 2.28, macOS now 4.x) uncovered, so add an ubuntu-26.04 job whose apt provides Mbed TLS 3.6. Net coverage: 2.28 (ubuntu-latest), 3.6 (ubuntu-26.04), 4.2 (macOS). ubuntu-26.04 is a public-preview runner image; fold it into the main ubuntu matrix once ubuntu-latest moves to 26.04. * Document Mbed TLS 4.x support and libtfpsacrypto rename Update README.md and the tour's TLS setup pages (en/ja) to note that Mbed TLS 4.x is now auto-detected and that it renames libmbedcrypto to libtfpsacrypto.