PHLEGM v6 Cross-Platform Baseline

PHLEGM v6 begins from the confirmed last-good PHLEGM v5 Developer Distribution dated 2026-0929-1542-4859.

Canonical v6 target matrix:
- Windows 32-bit OpenGL
- Windows 32-bit D3D11
- Windows 64-bit OpenGL
- Windows 64-bit D3D11
- Linux x86 OpenGL
- Linux x86 Vulkan
- Linux x86_64 OpenGL
- Linux x86_64 Vulkan

There is no PHLEGM v6 Unix target. Linux is named and handled explicitly.

Canonical v6 Developer Distribution layout:
PHLEGM-v6-Developer-Distribution-<timestamp>/
  PHLEGM/
    <working compiler/project tree>

Finished distribution ZIP files are emitted beside the outer Developer Distribution carrier, outside both the carrier and PHLEGM working project. Logs, old builds, archives, obsolete artifacts, and toolchains remain inside the PHLEGM working project.

Validation strategy:
- Linux targets: native Linux FreeBASIC and native execution.
- Windows targets: Windows FreeBASIC; Wine may be used on Linux for execution/build validation where the Windows toolchain is available.

The v5 Unix-labelled plumbing was incomplete and is not considered Linux compliance. v6 must audit and isolate remaining Win32 host dependencies rather than relabel them.
