fix(engine): match Dockerfile layout to root Taskfile dir: engine

engine/Dockerfile

@@ -10,17 +10,40 @@ RUN apt-get update \
     && rm /tmp/task.deb \
     && rm -rf /var/lib/apt/lists/*
 
-WORKDIR /app
+# The OSS repo's root Taskfile.yml expects engine tasks to run from ./engine/
+# (configured via `includes.engine.dir: engine`). The OSS-clone-build workflow
+# copies the root Taskfile.yml + .taskfiles/ into the engine build context, then
+# this Dockerfile copies them into the image. To match the Taskfile's expectations
+# at runtime, engine source must live at /app/engine/ — not flattened to /app/ —
+# so `task engine:run` can chdir there successfully and uv resolves
+# scripts/setup_env.py to /app/engine/scripts/setup_env.py.
+#
+# Layout:
+#   /app/Taskfile.yml          ← workflow-copied root Taskfile
+#   /app/.taskfiles/           ← workflow-copied .taskfiles
+#   /app/engine/pyproject.toml
+#   /app/engine/uv.lock
+#   /app/engine/.env
+#   /app/engine/scripts/       ← scripts/setup_env.py here
+#   /app/engine/src/           ← uvicorn entrypoint dir
+#   /app/engine/.venv/         ← uv-managed venv
+WORKDIR /app/engine
 
-COPY pyproject.toml uv.lock Taskfile.yml .env ./
+COPY pyproject.toml uv.lock .env ./
-COPY .taskfiles/ ./.taskfiles/
 COPY scripts/ ./scripts/
 RUN --mount=type=cache,target=/root/.cache/uv \
     uv sync --frozen --no-dev
 
 COPY src/ ./src/
 
-ENV PATH="/app/.venv/bin:$PATH"
+# Task definitions live at /app/ — root Taskfile + included .taskfiles — because
+# the root Taskfile's `includes.engine.dir: engine` is resolved relative to the
+# Taskfile's own location, so it must sit one level above engine/.
+WORKDIR /app
+COPY Taskfile.yml ./
+COPY .taskfiles/ ./.taskfiles/
+
+ENV PATH="/app/engine/.venv/bin:$PATH"
 ENV PYTHONUNBUFFERED=1
 
 EXPOSE 5001