r3d/runtime: allocs, keeps and births at 0 on this side

render3d: shadow_fit, water_reflection_pass, layer_partition_lods and the
GPU cull's scratch are made with the state; v3_dist is scalar; the pushes
into lists sized at start-up, the caps probe, the table growth, the loads
and the constructors declared with their bounds (one statement a line);
the renderer's name made once with the device; the two error messages
given back; the dead lupine models removed.

runtime: a component's text is held interned in its value cell (one copy
per distinct text), so the getter's own text goes with its frame instead
of being kept by ludic.ui's model - 80 of the 83 keeps.

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

packages/ludic.render3d/programs.ludic

@@ -16,6 +16,7 @@ function r3d_set_paths(render3d_st: mut Render3dState, root: string, assets: str
 
 # The install root, as the compiler computes it: $LUDIC_HOME, else the directory of the
 # `ludic` on PATH. A game running from its own tree finds this package there.
+@alloc_ok("once a run: the install root, asked only when the shaders are not beside the program")
 function r3d_home() -> string {
   let env = Os.env("LUDIC_HOME")
   if env != null and env != "" { return env }