libSceNpSessionSignaling technical debt

sceNpSessionSignalingInitialize, sceNpSessionSignalingCreateContext and sceNpSessionSignalingCreateContext2 - the initialization layout is 40 bytes; both context layouts are 56 bytes with callback and user-data pairs. The second context variant adds a group identifier to its connection callback. Pool allocation, callback delivery and underlying NP account validation are not implemented; priority and affinity settings do not affect host scheduling.
sceNpSessionSignalingGetConnectionStatus, sceNpSessionSignalingActivateSession and sceNpSessionSignalingActivateUser - initialization, context lookup and output validation follow the system library. Connections never activate in the offline runtime; activation returns unavailable and a connection query on a valid context returns connection-not-found without writing outputs. SDK-dependent peer-address validation and local-network discovery remain incomplete.
sceNpSessionSignalingCreateJoinActivate, sceNpSessionSignalingGetConnectionFromNetAddress, sceNpSessionSignalingGetCustomProperty, sceNpSessionSignalingGetGroupFromPeerAddress, sceNpSessionSignalingInitializeWithPort, sceNpSessionSignalingJoinActivate and sceNpSessionSignalingSetCustomProperty (libSceNpSessionSignaling) - names and NIDs are present in the PS5 3.20 export inventory, but no credible prototypes were found. They are declared without parameters solely to resolve known imports; this is not an ABI claim.