v0.3.1

Release packaging compatibility

• Restored a standalone injector.exe in every Windows x86 and x64 release archive.
• Added a ready-to-use cortex.asi beside cortex_core.dll; both files are verified byte-identical during packaging.
• Restored the architecture-matched cortex_test_target_x86.exe or cortex_test_target_x64.exe demonstration program.
• Added README_INSTALL.txt, a French installation and troubleshooting tutorial covering the standalone injector, unified host, ASI loader, token usage, diagnostics, and common errors.
• Added pull-request packaging validation so every required file is built and checked before a release can be published.
• Kept cortex_host.exe inject as the primary unified workflow while preserving the v0.2.0-compatible injector usage.