v0.6.0-rc39

Simplify Claude Code CLI arguments to fix execution issues

- Remove --model and --temperature arguments (not supported by Claude CLI)
- Remove complex --allowedTools logic, always use --dangerously-skip-permissions
- Remove validateTools method and related complexity
- Fix retry log messages to use stderr instead of stdout
- Clean up CLI argument generation for reliability
- Update package version to 1.0.8

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>