chore(tests): update bash code block tests to match preserved-bash behavior

Commit 9a0d866b changed _strip_fenced_code_blocks to preserve bash/shell
code blocks (they carry CLI setup and trigger-word metadata signal).
Update the two affected tests to expect bash content in the output
instead of asserting it is stripped.

- Rename test_bash_code_block_stripped → test_bash_code_block_preserved
- Update assertions: expect 'pip install' in result

tests/metadata_ops/test_metadata_ops.py

@@ -749,7 +749,9 @@ Some text.
         assert "## Usage" in result
         assert "## Description" in result
 
-    def test_bash_code_block_stripped(self):
+    def test_bash_code_block_preserved(self):
+        """Bash code blocks are preserved — they contain CLI setup commands
+        and trigger-word install instructions that carry metadata signal."""
         md = """## Setup
 ```bash
 pip install diffusers
@@ -757,13 +759,16 @@ huggingface-cli download repo
 ```
 """
         result = self._clean(md)
-        assert "pip install" not in result
+        assert "pip install" in result
+        assert "huggingface-cli download repo" in result
         assert "## Setup" in result
 
     def test_code_block_sections_remain_separated(self):
+        """Bash code blocks are preserved (they carry metadata signal),
+        and surrounding section headings survive."""
         md = "## Install\n```bash\npip install x\n```\n\n## Usage\nSome text."
         result = self._clean(md)
-        assert "pip install" not in result
+        assert "pip install x" in result
         assert "## Install" in result
         assert "## Usage" in result
         assert "Some text." in result