Add DLSS accuracy mode and GLIBC 2.41 release builds

- Add default-off PreferAccuracy for all native kernel families,
  including RDNA4 FP8 variants.

- Restore intermediate FP8 quantization, per-MMA FP16 rounding,
  denormal handling and NGX synchronization in accuracy mode.

- Select separately marked accuracy kernels and use a separate JIT
  cache; reject mixed sets and never silently substitute fast kernels.

- Add a pinned GLIBC 2.41 build environment for ZLUDA/LLVM, the DLLs
  and both kernel sets, with ABI checks and toolchain provenance.

- Support parallel target builds and pre-extracted PTX; correct
  ROCm header paths and Clang-CL input handling.

- Bump to 0.1.3 and update release notes, documentation and tests.

Validation: 11 tests passed; all 912 kernels built; E/K/M GPU harness
runs completed with accuracy off/on. Packaged libraries loaded under
GLIBC 2.41 and require no GLIBC version newer than 2.38.

RTX image-quality parity remains unverified.

Fixes #6
Refs #6

tools/d4r_nvngx_shim.cpp

@@ -529,6 +529,8 @@ static void load_portable_config()
 
     // Native kernels: d4r\kernels, each used only when DLSS's PTX for it matches (see the bridge).
     const std::string native = ascii_lower(ini_value(ini, "kernels", "NativeKernels"));
+    // The bridge selects accuracy variants and enforces their compiler/sync policy before cuInit.
+    portable_set_unix("D4R_PREFER_ACCURACY", ini_flag(ini, "kernels", "PreferAccuracy", 0) ? "1" : "0");
     const bool nativeOn = native.empty() || native == "on" || native == "true" || native == "1" || native == "fast";
     if (!nativeOn && native != "off" && native != "false" && native != "0")
         g_portable.notes.push_back("d4r.ini: [Kernels] NativeKernels must be on or off, not '" + native + "'");