Add PRV_Key_Store (resolver), PRV_Crypto_Helper (libsodium/OpenSSL), PRV_Key_Manager_Renderer (write-only Settings card), PRV_Key_Test_Ajax. Key resolver: PRV_OPENROUTER_API_KEY constant > prv_provider_key_enc option > none. All probe + test paths read key through PRV_Key_Store::get_key(). Security: - Ciphertext only in prv_provider_key_enc (hex nonce:hex ciphertext). - Enc key from SHA-256(AUTH_KEY+SECURE_AUTH_KEY) — never stored. - Plaintext never in options, logs, exceptions, page source, REST, or JS. - manage_options + nonce on set/remove/test. wp-config precedence enforced. - write-only UI: password input always renders empty; status text only. - uninstall.php prv_ wildcard DELETE covers prv_provider_key_enc. Files: 4 new (all ≤300 lines), 14 modified. Tests: test-key-store.php (encrypt/decrypt round-trip, wrong-key fails silently, resolver precedence, write-only render, Remove, constant wins). ARCHITECTURE/CONVENTIONS/CONTEXT/ CHANGELOG all updated in this commit. Agent-Session: 2026-06-15-pr-vision-v0.2.3-api-key-ui
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