Fix CI issues: indentation error in ollama_client.py, add missing message_generator.py, fix changelog_generator.py

- Fixed indentation error in ollama_client.py (extra space before docstring)
- Created missing message_generator.py module
- Fixed ChangelogGenerator to accept git_utils parameter
- Updated message_generator change type detection to prioritize test indicator
- Fixed test fixtures to properly pass mocked dependencies

app/src/git_commit_generator/ollama_client.py

@@ -1,4 +1,4 @@
- """Ollama client wrapper for LLM interactions."""
+"""Ollama client wrapper for LLM interactions."""
 import ollama as ollama_lib
 from ollama import ChatResponse, ListResponse