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* [Json] Implement sce::Json::Value and Json::String construct/set/destroy libSceJson previously only had the Initializer/MemAllocator setup path. The Value and String classes themselves were entirely absent, so a Prospero title that builds a JSON tree (Quake PPSA01880 does, to shape a web-API request) hit unresolved imports and faulted on the call. The imports it left unresolved right before its access violation are exactly these Value ctors/setters and String ctor/dtor. Model the Value/String payload host-side (JsonObjectHeap), keyed by the guest `this` pointer, following the handle-shadow pattern already used by Ngs2Exports. The guest object bytes are deliberately not written: these objects are usually stack-allocated with an unknown real layout, and writing a guessed layout risks smashing an adjacent stack canary (the same hazard the AudioOut2 context-param note in this tree records). Constructors and setters follow the Itanium ABI and return `this` in rax, which is correct whether the real setter returns void or Value&. Covered NIDs (complete-object C1/D1 variants, matching the observed imports): Value(default/bool/long/ulong/double/ValueType/char*/String), Value::~Value, Value::set(bool/long/ulong/double/ValueType/char*/String), Value::clear, String(char*/default/copy), String::~String. Only the payload the guest can reach through library methods is modelled; direct guest reads of the object bytes are out of scope and would need observed layout evidence. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * [Tests] Add SharpEmu.Libs.Tests covering the Json Value/String exports First test project for SharpEmu.Libs (xunit), the SharpEmu.Libs.Tests layout the maintainer already agreed to in issue #36. - A FakeCpuMemory (single contiguous region) drives the exports at the CpuContext level with no live guest. - Direct-call tests: ctor/setter round-trips for bool/int/uint/double (read from xmm0)/char*/String/ValueType, destructor cleanup, and the graceful-degradation paths (missing String shadow and a faulting char* pointer both fall back to the empty string instead of throwing). - Registration test: a real ModuleManager scans SharpEmu.Libs and the nine NIDs Quake left unresolved now resolve to the libSceJson exports and dispatch cleanly (returns `this` in rax). InternalsVisibleTo exposes JsonObjectHeap to the test assembly. The test project's packages.lock.json is committed for CI locked-mode restore; CI does not run tests yet, left as a maintainer decision. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> * [Json] Add Initializer::setGlobalNullAccessCallback Quake calls it during kexPSNWebAPI::Initialize and treats the not-found error as fatal for the whole Np Web API bring-up. Store the guest hook (never invoked by this HLE: shadows degrade to defaults instead of dereferencing missing members) and return success. Verified against the dump: the "setGlobalNullAccessCallback failed (0x80020002)" line is gone and kexPSNWebAPI::Initialize now logs "Np Web API Initialized"; the next blockers are sceNpAuthCreateRequest and sceUserServiceInitialize ordering, outside libSceJson. Also pins both Json test classes to one xunit collection: they share JsonObjectHeap statics and parallel class execution raced ResetForTests against a running test. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com>