render3d: a renderer that cannot draw says so and stops - LUDIC_HOME's leading ~ expanded (an unexpanded one left a run without shaders, logging 27 missing variants and drawing on), the SPIR-V manifest ends with E <count> and a cut or miscounted one is refused, and every such failure is a fault: r3d_open / r3d_load_step fail on it, r3d_fault() / r3d_fault_exit(code) for the game; tests/manifest_test

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

tools/ludic-cli/shaders.ludic

@@ -319,6 +319,8 @@ function cmd_shaders() -> int {
       made_c += 1
     }
   }
+  # the end line: the renderer refuses a manifest without it, or whose count is not its programs'
+  sb_puts(mf, `E {string(made)}\n`)
   if not write_file(`{outdir}/manifest.txt`, sb_str(mf)) { err("shaders: cannot write manifest.txt\n");  return 1 }
   if check {
     let real = "packages/ludic.render3d/shaders/spv"