Delete stale CRITICAL_TEMPERATURE_BUG.md

.github/workflows/reusable_lint.yaml

@@ -8,7 +8,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Check formatting
-        uses: "lgeiger/black-action@master"
+      - name: Set up Python 3.13
+        uses: actions/setup-python@v5
         with:
-          args: ". -l 79 --check"
+          python-version: "3.13"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
+      - name: Check formatting with ruff
+        run: uvx ruff format --check .

changelog.d/fix-ci-lint-use-ruff.fixed.md

@@ -0,0 +1,4 @@
+CI lint job now runs `ruff format --check .` instead of the retired
+`black -l 79 --check`. The Makefile was switched to `ruff format` in #40
+but the reusable lint workflow was not updated, so every PR's `lint` check
+was failing on files already formatted with ruff.

changelog.d/fix-remove-stale-temperature-doc.removed.md

@@ -0,0 +1,3 @@
+Delete `CRITICAL_TEMPERATURE_BUG.md`: the temperature bug it documented is
+now fixed in `HardConcrete._deterministic_gates`, and the doc also pointed
+at a nonexistent file (`l0_louizos_improved_gate.py`).