chronicle/logstory

AI Summary: Implement support for a new environment variable, `LOGSTORY_CREDENTIALS_STRING`, allowing users to provide Google service account credentials as a JSON string instead of a file path. This requires modifying the credential handling logic in `logstory.py` to prioritize the new variable, adding JSON parsing and validation, updating documentation to include the new variable and its usage, and creating comprehensive tests to ensure functionality and backward compatibility.

AI Summary: The task involves addressing high-priority code quality and security issues in the Logstory Python project post-v1.0.0 release, including fixing security warnings, ensuring all pre-commit hooks pass, performing comprehensive testing (functionality and edge cases), reviewing and updating documentation (migration guide and CHANGELOG), and addressing medium-priority user experience improvements such as enhanced error messages and optional auto-completion support. Low-priority tasks include future enhancements like configuration validation and interactive setup.