chore: remove PyPI tombstone, replace flake8 with ruff in CI

compat/comexdown/ shim removed (not publishing to PyPI).
Workflows now use ruff (already a dev dependency) instead of flake8.

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

Author: dankkom

.github/workflows/publish.yml

@@ -27,12 +27,9 @@ jobs:
     - name: Install dependencies
       run: |
         uv sync --all-extras
-    - name: Lint with flake8
+    - name: Lint with ruff
       run: |
-        # stop the build if there are Python syntax errors or undefined names
-        uv run flake8 src/comex_fetcher --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        uv run flake8 src/comex_fetcher --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+        uv run ruff check src/comex_fetcher
     - name: Test with pytest
       run: |
         uv run pytest --cov=comex_fetcher

.github/workflows/tests.yml

@@ -30,12 +30,9 @@ jobs:
     - name: Install dependencies
       run: |
         uv sync --all-extras
-    - name: Lint with flake8
+    - name: Lint with ruff
       run: |
-        # stop the build if there are Python syntax errors or undefined names
-        uv run flake8 src/comex_fetcher --count --select=E9,F63,F7,F82 --show-source --statistics
-        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        uv run flake8 src/comex_fetcher --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+        uv run ruff check src/comex_fetcher
     - name: Test with pytest
       run: |
         uv run pytest --cov=comex_fetcher