Merge branch 'lang/foundations' into lang/ecs

changes/vulkan-leaks.md

@@ -0,0 +1,15 @@
+bump: patch
+type: fix
+**The Vulkan renderer no longer leaks memory as it loads and draws.** Every texture upload
+malloc'd a CPU copy of its pixels and never freed it (236 MB over the valley's boot, and again on
+every model loaded later); the pixels are now converted straight into the mapped staging buffer.
+The per-level and per-layer views made for mipmapped and layered targets outlived their texture,
+and on MoltenVK a view keeps its Metal texture alive, so every rebuild of the screen-sized targets
+left the last set in memory; a released texture now takes its views with it, and the cache is
+keyed by numbers rather than a string built on every call. The Vulkan structs filled for a draw, a
+pass, a barrier, a descriptor set or a buffer (about sixty call sites, several per draw) come from
+a reused 1 MB scratch ring instead of a malloc each; the descriptor-set cache and the retired
+buffer list are emptied and refilled rather than replaced; and on macOS the frame drains an
+autorelease pool (`Vk.frame_pool()`), which MoltenVK and the layer rely on. `R3D_VK_PROF` now
+also prints, every 120 frames, the Vulkan objects made and destroyed by kind and the length of
+every cache, so a kind made each frame and never destroyed shows at once.