feat(quickemu): enable GL on macOS (cocoa) and prefer virtio GL

[flexiondotorg]

• Add check_cocoa_gl_es_support(): detect QEMU cocoa gl=es support and look for
  ANGLE/libEGL in QEMU prefix, Homebrew and DYLD paths
• Use the check in configure_display() to enable "gl=es" for cocoa when available
  and fall back to disabling GL (preserving previous stability behaviour)
• Improve virtio GL selection: prefer virtio-gpu(-gl) / virtio-gpu-gl-pci /
  virtio-vga-gl variants when GL is enabled and QEMU exposes the device
• Remove the hard disable of GL for cocoa in display_param_check() (now handled
  by the detection function)
• Ensure user-visible display/GL/VirGL status remains printed for diagnostics
  Enables safer GL usage on macOS (covers Nix/Homebrew QEMU and ANGLE cases);
  falls back cleanly when support is absent.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• I have performed a self-review of my code
• I have tested my code in common scenarios and confirmed there are no regressions

[cubic-dev-ai]

1 issue found across 1 file

Confidence score: 3/5

• Portability risk: quickemu uses grep with \| in BRE, which fails on macOS without -E, so pattern matching may break for macOS users.
• Score reflects a concrete cross-platform behavior issue with medium severity, though it’s localized and straightforward to fix.
• Pay close attention to quickemu - grep alternation should use -E for macOS compatibility.

Prompt for AI agents (all issues)

Check if these issues are valid — if so, understand the root cause of each and fix them.


<file name="quickemu">

<violation number="1" location="quickemu:968">
P1: BSD grep on macOS doesn't support `\|` alternation in BRE. Use `-E` flag for extended regex to ensure the pattern works correctly on macOS.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}