add tester ui, and restructure folders

ctrl/Dockerfile.lambda

@@ -2,9 +2,27 @@ FROM python:3.13-slim
 
 WORKDIR /app
 
+# Function-specific deps first. Each function carries its own requirements.txt
+# (so a real AWS deploy zips the function folder verbatim). Locally, the pod
+# installs the union of all of them.
+COPY functions/ ./functions/
+RUN set -e; \
+    for r in functions/*/requirements.txt; do \
+        [ -f "$r" ] && pip install --no-cache-dir -r "$r"; \
+    done
+
+# Runner deps (FastAPI + uvicorn). Lives only in the runner pod; NOT bundled
+# with any function zip for AWS.
 COPY requirements.txt ./
 RUN pip install --no-cache-dir -r requirements.txt
 
-COPY lambda_function.py invoke.py seed.py ./
+# Shared modules (Lambda-Layer equivalent) and generic tooling.
+COPY shared/ ./shared/
+COPY invoke.py runner.py ./
 
-CMD ["sleep", "infinity"]
+# uvicorn --reload restarts on .py change → every code edit produces a fresh
+# cold start, matching how AWS Lambda's container lifecycle works when you
+# redeploy. Watching the whole /app tree picks up function-folder edits too.
+CMD ["uvicorn", "runner:app", \
+     "--host", "0.0.0.0", "--port", "8000", \
+     "--reload", "--reload-dir", "/app"]