🛡️ Sentinel: Fix CI version and add input sanitization

- Corrected non-existent GitHub Action version for checkout in workflows.
- Implemented input normalization in app.py to strip whitespace.
- Added test case for whitespace-only name inputs.

Author: google-labs-jules[bot]

.github/workflows/check.yml

@@ -14,7 +14,7 @@ jobs:
           - "3.13"
           - "3.12"
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
       - uses: jdx/mise-action@v4
         with:
           tool_versions: |

.github/workflows/docs.yml

@@ -10,7 +10,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
       - uses: jdx/mise-action@v4
       - name: Configure Git Credentials
         run: |

project/app.py

@@ -23,6 +23,7 @@ def main(name: str = "World"):
     Args:
       name: the name to be greeted
     """
+    name = name.strip() or "World"
     if len(name) > 100:
         raise UsageError("Invalid name: maximum length is 100 characters.")
     if not name.isprintable():

tests/test_app.py

@@ -26,6 +26,13 @@ def test_greet():
     assert "Hello Jules! 👋" in result.output
 
 
+def test_greet_whitespace():
+    runner = CliRunner()
+    result = runner.invoke(main, ["--name", "   "])
+    assert result.exit_code == 0
+    assert "Hello World! 👋" in result.output
+
+
 def test_name_too_long():
     runner = CliRunner()
     result = runner.invoke(main, ["--name", "A" * 101])