libSceTextToSpeech2 technical debt

libSceTextToSpeech2 has no speech engine: sceTextToSpeech2Initialize, sceTextToSpeech2Open, sceTextToSpeech2Speak, sceTextToSpeech2Cancel, sceTextToSpeech2Close, sceTextToSpeech2Terminate and the system/speech status queries return EOPNOTSUPP. PPSA01317 skips its narration set-up when initialization fails

sceTextToSpeech2ConvertTextInt, sceTextToSpeech2GetAudioInt, sceTextToSpeech2InitializeInt, sceTextToSpeech2OpenInt, sceTextToSpeech2RegisterTextConversionItem and sceTextToSpeech2SynthesizeInt have unknown signatures and behaviour. The parameterless int declarations are import-resolution placeholders, not confirmed ABI signatures, and every call throws through NotImplemented_nid_no_patch. Only the names and NIDs are established by the 13.60 export inventory; not measured on a console.
sceTextToSpeech2Initialize (libSceTextToSpeech2) - the console's error for an unavailable speech engine is unknown; it returns the kernel's EOPNOTSUPP (0x8002002D). PPSA01317 passes a param that starts with 0x2000000 and only tests the result for non-zero.