Release v1.5.0

What's Changed

• feat(config): fall back to gh auth token when env GITHUB_TOKEN is empty (#234) by @linhdmn in #259
• fix(git): classify dirty non-doc worktrees as operator-degraded, not provider-degraded (#245) by @linhdmn in #260
• test(orchestrator): fix date-drift in autopr grace-window fixtures by @linhdmn in #261

Full Changelog: v1.4.0...v1.5.0