ci(deps): run lowest-dependency check in the PR unit job

Author: harryswift01

.github/workflows/dependency-floors.yaml

@@ -1,10 +1,6 @@
 name: Dependency Floors
 
 on:
-  pull_request:
-    paths:
-      - pyproject.toml
-      - .github/workflows/dependency-floors.yaml
   schedule:
     - cron: '0 8 * * 1'
   workflow_dispatch:

.github/workflows/pr.yaml

@@ -38,6 +38,19 @@ jobs:
       - name: Pytest unit • ${{ matrix.os }}, ${{ matrix.python-version }}
         run: python -m pytest tests/unit
 
+      - name: Install uv
+        run: python -m pip install uv
+
+      - name: Resolve lowest dependencies as wheels
+        run: |
+          uv pip compile pyproject.toml --resolution lowest-direct --only-binary :all: --output-file lowest.txt
+
+      - name: Install lowest dependencies
+        run: uv pip install --system --reinstall --resolution lowest-direct -e ".[testing]"
+
+      - name: Pytest unit at lowest dependencies • ${{ matrix.os }}, ${{ matrix.python-version }}
+        run: python -m pytest tests/unit
+
   discover-systems:
     name: Discover regression systems
     runs-on: ubuntu-26.04

docs/developer_guide.rst

@@ -181,9 +181,9 @@ bound (floor) is the oldest release CodeEntropy is known to work with, so that i
 stays installable alongside other scientific packages. Floors are only raised
 when the code needs a newer release. Upper bounds are widened by Renovate.
 
-The ``dependency-floors.yaml`` workflow checks this on pull requests that change
-``pyproject.toml`` and weekly. It checks that the lowest allowed versions resolve
-to installable wheels on each platform and Python version, and that the unit tests
+The unit job in the pull request workflow and the weekly ``dependency-floors.yaml``
+workflow check this. They check that the lowest allowed versions resolve to
+installable wheels on each platform and Python version, and that the unit tests
 pass with them installed.
 
 Run the same checks locally with `uv <https://docs.astral.sh/uv/>`_::