diff --git a/.gitignore b/.gitignore
index 707d430b13..4ad6684de2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,7 +16,10 @@
 .repl
 opencode.json
 .opencode/package-lock.json
+/*.html
 /*.jpg
+/*.json
+!/package.json
 /*.md
 !CHANGES.md
 !CONTRIBUTING.md
@@ -91,7 +94,14 @@ opencode.json
 /playwright/.cache/
 /render-wasm/target/
 /render-wasm/.render-wasm-build.lock
+
+# render-wasm build artifacts copied into the exporter (autogenerated)
+/exporter/resources/wasm/render-wasm.js
+/exporter/resources/wasm/render-wasm.wasm
+/exporter/src/app/wasm/shared.js
+
 /media-processor/dist/
+/media-processor/target/
 /**/node_modules
 /**/.yarn/*
 /.pnpm-store
@@ -112,4 +122,5 @@ opencode.json
 /.ci-logs
 /tmp/
 /.codex/
+/scripts/__pycache__/
 /tools/__pycache__
diff --git a/.serena/memories/exporter/core.md b/.serena/memories/exporter/core.md
index 9b7078045b..f48948d8d6 100644
--- a/.serena/memories/exporter/core.md
+++ b/.serena/memories/exporter/core.md
@@ -5,6 +5,7 @@
 ## Layout and commands
 
 - Source: `exporter/src/`; config: `deps.edn`, `shadow-cljs.edn`, `package.json`; runtime helpers/assets: `vendor/`, `scripts/`.
+- `exporter/resources/wasm/render-wasm.{js,wasm}` and `exporter/src/app/wasm/shared.js` are generated render-wasm build output, not source: they are gitignored. Never hand-edit or commit them; regenerate by rebuilding render-wasm.
 - From `exporter/`: setup `./scripts/setup`; watch `pnpm run watch` or `pnpm run watch:app`; production build `pnpm run build`; test bundle `pnpm run build:test`; tests `pnpm run test` or `pnpm run test:quiet`; lint `pnpm run lint:clj`; format check/fix `pnpm run check-fmt:clj` / `pnpm run fmt:clj`.
 - Because exporter consumes `common/`, shared file/shape/model changes may need exporter verification even when the immediate change is not under `exporter/`.
 - Cross-cutting testing principles and anti-patterns: `mem:testing`.
diff --git a/.serena/memories/render-wasm/core.md b/.serena/memories/render-wasm/core.md
index 17345b7a7d..88cf0e560e 100644
--- a/.serena/memories/render-wasm/core.md
+++ b/.serena/memories/render-wasm/core.md
@@ -20,6 +20,8 @@
 
 `./build` sources `_build_env`, which sets the Emscripten paths and `EMCC_CFLAGS`. The WASM heap starts at 256 MB and uses geometric growth.
 
+Build output is gitignored and stays untracked everywhere it lands: `frontend/resources/public/js/render-wasm.{js,wasm}` and `frontend/src/app/render_wasm/api/shared.js` from `./build`, plus `exporter/resources/wasm/render-wasm.{js,wasm}` and `exporter/src/app/wasm/shared.js`. Never commit generated JS/WASM; rebuild instead.
+
 ## Commands
 
 From `render-wasm/`: