CI: pre-install ruckig from fixed upstream SHA

ruckig 0.17.3 on PyPI is sdist-only and its build config still uses
cmake.targets, which scikit-build-core 1.0 rejects as a hard error —
every CI job has died at dependency install since the 1.0 release.
Upstream fixed the rename on main (pantor/ruckig#262) but has not cut
a release, so pre-install that commit before ".[dev]" in both the lint
and test jobs; its version (0.17.3) satisfies the ruckig>=0.12.2 pin,
so the dev install leaves it in place. Drop the override once a fixed
ruckig release lands.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01M7tEqGhaTqJV6ZxCXgMpFU

Author: Jepson2k

.github/workflows/tests.yml

@@ -24,6 +24,11 @@ jobs:
         shell: bash
         run: |
           python -m pip install --upgrade pip
+          # ruckig 0.17.3 (sdist-only) fails to build under scikit-build-core
+          # 1.0 (cmake.targets was renamed to build.targets); pre-install the
+          # fixed upstream commit until a release lands.
+          # https://github.com/pantor/ruckig/pull/262
+          pip install "ruckig @ git+https://github.com/pantor/ruckig@2249d57ffaa19ecdadeaab62daf97857813629ff"
           pip install -e ".[dev]"
           # Override the pinned waldoctl with the matching feature branch if one
           # exists, AFTER ".[dev]" (and with --force-reinstall) so the pinned tag
@@ -106,6 +111,11 @@ jobs:
       - name: Install package
         run: |
           python -m pip install --upgrade pip
+          # ruckig 0.17.3 (sdist-only) fails to build under scikit-build-core
+          # 1.0 (cmake.targets was renamed to build.targets); pre-install the
+          # fixed upstream commit until a release lands.
+          # https://github.com/pantor/ruckig/pull/262
+          pip install "ruckig @ git+https://github.com/pantor/ruckig@2249d57ffaa19ecdadeaab62daf97857813629ff"
           pip install -e ".[dev]" pytest-timeout
           # Override the pinned waldoctl with the matching feature branch if one
           # exists, AFTER ".[dev]" (and with --force-reinstall) so the pinned tag