ci: fix indentation in cli-wheel-clean-install Python heredoc (#273)

The cli-wheel-clean-install lane introduced in v0.53.4 (#272) failed on
its first main run with `IndentationError: unexpected indent`: YAML
`run: |` preserves the relative indent of the inline `python3 -c`
heredoc, so the Python interpreter saw `try:` at column 12 and refused
to parse.

Fix: write the assertion script to /tmp/smoke.py via a `cat <<'PY'`
heredoc (left-aligned content lands flat), mount it into the container,
and invoke the tool's venv python directly
(`$HOME/.local/share/uv/tools/agnes-the-ai-analyst/bin/python`).
Cleaner than the previous inline form and side-steps `uv tool run
--from <name>` doing a PyPI lookup that fails because we don't publish
there.

Verified locally with the same docker run as the CI step — prints
`OK: kbcstorage absent, urllib3 2.7.0`.

.github/workflows/ci.yml

@@ -55,9 +55,26 @@ jobs:
       - name: Build wheel
         run: uv build --wheel --out-dir dist
 
+      - name: Write CLI install assertion script
+        run: |
+          cat > /tmp/smoke.py <<'PY'
+          import sys, urllib3
+          try:
+              import kbcstorage  # noqa: F401
+              sys.exit("REGRESSION: kbcstorage leaked into the CLI wheel — should be in [server] extra only")
+          except ImportError:
+              pass
+          maj, minor = (int(x) for x in urllib3.__version__.split(".")[:2])
+          assert (maj, minor) >= (2, 7), f"urllib3 too old: {urllib3.__version__}"
+          print(f"OK: kbcstorage absent, urllib3 {urllib3.__version__}")
+          PY
+
       - name: Smoke install in fresh python:3.13-slim
         run: |
-          docker run --rm -v "$PWD/dist:/wheels:ro" python:3.13-slim bash -c '
+          docker run --rm \
+            -v "$PWD/dist:/wheels:ro" \
+            -v /tmp/smoke.py:/smoke.py:ro \
+            python:3.13-slim bash -c '
               set -euo pipefail
               apt-get update -qq && apt-get install -y -qq --no-install-recommends curl ca-certificates >/dev/null
               curl -LsSf https://astral.sh/uv/install.sh | sh > /dev/null 2>&1
@@ -67,16 +84,8 @@ jobs:
               agnes --version
               agnes --help > /dev/null
               agnes catalog --help > /dev/null
-            python3 -c "
+              # Run the assertion in the same venv uv tool created
-            try:
+              "$HOME/.local/share/uv/tools/agnes-the-ai-analyst/bin/python" /smoke.py
-                import kbcstorage
-                raise SystemExit(\"REGRESSION: kbcstorage leaked into the CLI wheel — should be in [server] extra only\")
-            except ImportError:
-                pass
-            import urllib3
-            assert tuple(int(x) for x in urllib3.__version__.split(\".\")[:2]) >= (2, 7), urllib3.__version__
-            print(\"OK: kbcstorage absent, urllib3\", urllib3.__version__)
-            "
             '
 
   docker-build: