render3d: VkAllocationCallbacks counted (R3D_ALLOC_VK), pipeline create infos freed, actor pool at init

Plan 25.1c: vk_mac.ll's @lvk_ac (posix_memalign under a 16-byte header of scope/offset/size, atomic
counters) passed at every render3d create/destroy (49 sites; the caps probe keeps its own null pair);
lvk_ac_bytes/_peak/_allocs/_scope_bytes for the fence, Vk.alloc_bytes. vk_win.ll: null and 0.
MoltenVK 1.4.2 counted 0 live bytes through them in steady. Fence findings: gvk_pipeline freed its 17
create infos (and reuses one bufs list); actor_init fills ac_spare with 512 records (actor_fresh,
m4_new, v3_new at first placement in play). Compiled, not run (the user's call).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/ludic.render3d/env.ludic

@@ -691,6 +691,8 @@ export state Render3dState {
   stream_walks: int = 0          # streams that walked their whole ring this frame
   stream_debug_n: int = 0
   stream_scratch: floats = null
+  gvk_pipe_bufs: words = null      # a pipeline's vertex buffers, while it is made
+  gvk_ac: pointer = null           # the VkAllocationCallbacks every create and destroy is given (R3D_ALLOC_VK=1)
   gvk_prime_b: words = null        # buffers made since the frame began, read once so MoltenVK makes their
   gvk_prime_h: []long = null       # Metal buffers now (gvk_prime), and their handles
   gvk_prime_n: int = 0