fix(adr-117/p5): smoke-test must cd out of repo root before importing

Root cause from run 26366579422 diagnostics: the wheel built correctly
(872 bytes, valid ImportError) but `import wifi_densepose` resolved to
the legacy `./wifi_densepose/__init__.py` left in the repo root from
v1, NOT to the freshly-installed tombstone wheel in the smoke venv.

Python places the cwd at sys.path[0] for `python -c "..."`, so
running the import from the repo root made the legacy directory win
over site-packages every time. The "isolated venv" was not the
problem — the cwd was.

Fix: copy the wheel to /tmp, cd /tmp before the import. Now the
smoke test runs in a directory that contains no `wifi_densepose/`
so the only resolution path is the venv's site-packages.

The repo-root `./wifi_densepose/__init__.py` is a separate concern
(legacy v1 carry-over) that should be cleaned up in a follow-up
commit, but the smoke test should not depend on it being absent.

Co-Authored-By: claude-flow <ruv@ruv.net>

.github/workflows/pip-release.yml

@@ -179,12 +179,18 @@ jobs:
       - name: Smoke-test tombstone in isolated venv
         run: |
           set -e
+          # Copy the wheel to /tmp BEFORE entering the venv — we must
+          # cd OUT of the repo root because the repo contains a
+          # `wifi_densepose/` directory left over from the legacy v1
+          # source. Python puts cwd at sys.path[0], so an import from
+          # the repo root would resolve to the legacy directory and
+          # bypass the freshly-installed wheel entirely (this was the
+          # silent failure mode of the previous two run attempts).
+          cp tombstone-dist/wifi_densepose-1.99.0-py3-none-any.whl /tmp/
           python -m venv /tmp/smoke-venv
           /tmp/smoke-venv/bin/python -m pip install --upgrade pip
-          /tmp/smoke-venv/bin/python -m pip install tombstone-dist/wifi_densepose-1.99.0-py3-none-any.whl
-          # Show where wifi_densepose actually resolved + that the file
-          # the venv would import is the tombstone, NOT something else
-          # on the path.
+          /tmp/smoke-venv/bin/python -m pip install /tmp/wifi_densepose-1.99.0-py3-none-any.whl
+          cd /tmp  # away from the repo root's stray wifi_densepose/
           /tmp/smoke-venv/bin/python -c "import importlib.util as u; s = u.find_spec('wifi_densepose'); print('Resolved to:', s.origin); print('--- file content ---'); print(open(s.origin).read())"
           set +e
           /tmp/smoke-venv/bin/python -c "import wifi_densepose" 2> import-output.txt