fix(#1): Use uv run for twine in publish pipeline step

twine is installed into the venv via uv pip install, so it must be
invoked with `uv run twine` to find it on PATH. Also simplify version
check by using twine's --skip-existing flag instead of pip index lookup.

Refs #1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.woodpecker.yml

@@ -66,24 +66,18 @@ steps:
     commands:
       - |
         uv sync --all-extras --frozen
-        CURRENT=$(python3 -c "import tomllib; print(tomllib.load(open('pyproject.toml','rb'))['project']['version'])")
+        uv pip install twine
+        CURRENT=$$(uv run python3 -c "import tomllib; print(tomllib.load(open('pyproject.toml','rb'))['project']['version'])")
         echo "Building version $$CURRENT..."
         uv build
-        uv pip install twine
-        PUBLISHED=$(pip index versions mosaicstack-telemetry \
-          --index-url "https://$$GITEA_USER:$$GITEA_TOKEN@git.mosaicstack.dev/api/packages/mosaic/pypi/simple/" \
-          2>/dev/null | grep -oP '\(\K[^)]+' || echo "0.0.0")
-        if [ "$$CURRENT" = "$$PUBLISHED" ]; then
-          echo "Version $$CURRENT already published, skipping"
-        else
-          echo "Publishing $$CURRENT (was $$PUBLISHED)..."
-          twine upload \
-            --repository-url "https://git.mosaicstack.dev/api/packages/mosaic/pypi" \
-            --username "$$GITEA_USER" \
-            --password "$$GITEA_TOKEN" \
-            dist/*
-          echo "Published mosaicstack-telemetry $$CURRENT"
-        fi
+        echo "Publishing $$CURRENT..."
+        uv run twine upload \
+          --repository-url "https://git.mosaicstack.dev/api/packages/mosaic/pypi" \
+          --username "$$GITEA_USER" \
+          --password "$$GITEA_TOKEN" \
+          --skip-existing \
+          dist/*
+        echo "Published mosaicstack-telemetry $$CURRENT"
     when:
       - branch: [main, develop]
         event: [push, manual, tag]