[main] Add yellow color for unverified models when API unavailable

[main] Refactor API key resolution and add live model validation with stale detection

version bump

[main] Show available configs when config not found

Fix version detection for uv installations and bump to 0.1.9

Improve test coverage to meet 80% minimum requirement

Increment micro version to 0.1.7 and update related files

chore: Increment version to 0.1.6

feat: Add API key configuration support for model providers

[main] Bump version to 0.1.5

[main] Refactor config loading to return config data directly instead of modifying state

feat: Increment version to 0.1.4

feat: Increment version to 0.1.3 and update test

[main] Remove CHANGES.md and set ANTHROPIC_API_KEY to None in config

Remove 'None' as model option and force model selection