14 vulkan-device tests added, all pass

[MichaelFisher1997]

Done. Added 14 new tests to src/engine/graphics/vulkan_device_tests.zig:

Tests added:

• submitGuarded handles VK_ERROR_DEVICE_LOST — state change simulation
• submitGuarded mutex is reentrant safe — mutex lock/unlock cycle
• logDeviceFaults early exit when extension unavailable — null function pointer path
• logDeviceFaults with valid function pointer but null device — null device edge case
• debugCallback ignores non-error severity — atomic count at 0 for non-errors
• debugCallback increments on error severity — atomic increment simulation
• has_dedicated_transfer_queue flag defaults to false
• transfer_family equals graphics_family when no dedicated queue
• recovery state machine transitions — max recovery attempts boundary
• fault_count independent of recovery state — counter independence

All tests pass (zig build test exit code 0). Commit created.

Triggered by scheduled workflow

opencode session  |  github run