chore: Improve release skills (#754)

Author: ValerianRey

skills/check-release/SKILL.md

@@ -64,7 +64,7 @@ Verify the installed version matches X.Y.Z:
 cd /tmp/test_torchjd_install && uv pip show torchjd
 ```
 
-If the version is wrong, report it and stop.
+If the version is wrong, you may need to install with `--no-cache`.
 
 ### Step 7: Smoke-test the newly added classes
 

skills/prepare-release/SKILL.md

@@ -80,7 +80,7 @@ In `pyproject.toml`, update the `version` field under `[project]`:
 
 ### Step 7: Open the release PR
 
-Stage changes, then open a pull request targeting `main`.
+Checkout a new branch release-vX.Y.Z, stage changes, commit, then open a pull request targeting `main`.
 Return the PR URL when done.
 
 ### Step 8: Create a draft release on GitHub