Release kanopy-ai 0.5.0

[NicPfitzer]

Summary

• add cursor-based iter_jobs() and iter_projects() helpers
• expose skip_count for efficient multi-page job scans
• synchronize the slim API-key job contract
• document on-demand output sizes
• accept both standard Setuptools wheel license layouts
• bump package version to 0.5.0

Validation

• staging read-only acceptance: 30 jobs over 3 cursor pages, exact totals and no duplicates
• 31 SDK tests
• Ruff lint and format checks
• wheel and sdist build
• Twine and distribution-content checks
• clean wheel install/version verification