feat: release 0.7.x — observability improvements, retry enhancements, and documentation updates

[romanindev]

This PR introduces the 0.7.x release of @dfsync/client, focusing on improving observability, refining retry behavior, and aligning documentation with the latest API changes.

✨ Highlights

• Improved request observability
  • better visibility into request lifecycle
  • enhanced metadata available in hooks
• Retry behavior enhancements
  • improved handling of retry conditions
  • better support for Retry-After scenarios
  • more predictable retry flow
• Documentation updates
  • aligned docs with current API behavior
  • reduced duplication across sections
  • improved structure for easier maintenance

🛠 Internal

• small refactors to support new behavior
• cleanup and consistency improvements across the codebase

📦 Release scope

This is a minor release (0.7.x) focused on incremental improvements and developer experience.
No breaking changes expected.

Notes

• existing APIs remain stable
• backward compatibility is preserved
• safe to upgrade from 0.6.x