Clay's debug inspector (Clay__RenderDebugView, ~700 lines + ~150 UI strings) is reachable from the exported Clay_EndLayout behind a runtime debugModeEnabled branch, so --gc-sections can't drop it; at -O2 clang inlines it into the layout monolith. clayterm never enables debug mode, so it's dead weight. Adds an upstream-compatible CLAY_DISABLE_DEBUG_TOOLS guard (patches/clay-disable-debug-tools.patch) applied to the clay submodule at build time and opted in via -DCLAY_DISABLE_DEBUG_TOOLS. raw wasm 155,934 -> 111,234 (-28.7%); brotli 41,809 -> 30,417; npm esm/wasm.js 53,143 -> 38,903 (-13.9 KB unpacked). Cold path only (debugModeEnabled always false at runtime); deno task test passes.