build: v6.2.0 — disable AVX-512 autovec, fix v6.1.9 SIGILL

v6.1.9 was built on a GitHub Actions EPYC 7763 runner (AVX-512 capable)
and contained 741 vpbroadcastq EVEX instructions in inlined libstdc++
std::string paths. The resulting binary crashed with SIGILL on every
production node: KVM EPYC (DNS2), Ryzen 5 3600 (SAMI-PC), and any
non-x86_64 node.

cmake/AddCompilerFlags.cmake already set -march=x86-64-v2 -mtune=generic
but GCC 11.4 + libstdc++ inlining still autovectorized some paths to
AVX-512. The fix adds an explicit -mno-avx512f -mno-avx512* block
inside CMAKE_X86_64_BASELINE so the build cannot leak AVX-512 regardless
of the build host's capabilities.

Carries forward the v6.1.9 staking-selfheal fix (f69f087) unchanged.
Bump version 6.1.9 -> 6.2.0 to reflect the build-system change.

See references/avx-512-sigill-build-fix.md for the full diagnosis
recipe and the verification steps.

packaging/scoop/triangles.json

@@ -1,11 +1,11 @@
 {
-    "version": "6.1.7",
+    "version": "6.2.0",
     "description": "Cryptographic Triangles (TRI) cryptocurrency wallet with PoS staking and encrypted messaging",
     "homepage": "https://cryptographic-triangles.org",
     "license": "MIT",
     "architecture": {
         "64bit": {
-            "url": "https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.1.7/Cryptographic-Triangles-6.1.7-win-x64.zip",
+            "url": "https://github.com/SamiAhmed7777/triangles_v5/releases/download/v6.2.0/Cryptographic-Triangles-6.2.0-win-x64.zip",
             "hash": "6f002a669a7e92aaf3d8dd7b1ae80f06a086c99a15ca05cf107665009ffc06b7"
         }
     },