Update changelog for v0.0.171

Summary

This PR updates the CHANGELOG.md file to document the release of CLI v0.0.171. The changes include:

• Added new changelog entry for v0.0.171 (dated 2025-10-03)
• Documented changes from PR Changed up the function signature and add a couple features #460 under "Added" and "Changed" sections
• Added version comparison link at the bottom of the file

The changelog follows Keep a Changelog format and maintains consistency with existing entries.

Review & Testing Checklist for Human

• Verify changelog accuracy: Confirm that the documented changes accurately reflect what's actually in v0.0.171 by reviewing the commits between v0.0.170 and v0.0.171
• Confirm release date: Validate that 2025-10-03 is the correct release date for v0.0.171 (or update if different)
• Check for missing changes: Ensure no other significant changes between v0.0.170 and v0.0.171 are missing from the changelog

Notes

• This change is based on PR Changed up the function signature and add a couple features #460 "Changed up the function signature and add a couple features"
• The categorization splits this into "Added" (multi-file YAML prompt support) and "Changed" (function signature modifications) - please verify this accurately reflects the actual changes
• Link to Devin run: https://app.devin.ai/sessions/c18b2e6553514a8d90e1532b371348f6
• Requested by: unknown user

Summary by CodeRabbit

• New Features

  • Support for prompts split across multiple YAML files for easier management of large or modular prompts.
  • Improved code generation for more accurate and consistent outputs.

• Documentation

  • Changelog updated with v0.0.171 (2025-10-03), including a release entry and comparison link.

• Chores

  • Release housekeeping for v0.0.171.

No breaking changes to public APIs.