Revert "First pass at nodes"

This reverts commit 618f09689d.

AGENTS.md

@@ -94,12 +94,6 @@ void prNodeDestroy(PrNode *n, PrAllocator *alloc);
 Use wapp allocators (`WpAllocator`, arena-based). Stack-allocate where
 possible; pass allocators explicitly.
 
-**Never use libc for memory or file I/O.** wapp always takes precedence:
-- `wpMemAllocatorAlloc` / `wpMemAllocatorFree` instead of `malloc` / `free`
-- `wpFileOpen` / `wpFileRead` / `wpFileClose` instead of `fopen` / `fread` / `fclose`
-
-For one-shot loads (e.g. SPIR-V at init), use `&_G_RHI_CONTEXT.allocator`.
-
 ```c
 PrGraph *prGraphCreate(PrAllocator *alloc);
 void     prGraphDestroy(PrGraph *g, PrAllocator *alloc);