Release v0.15.6

What's Changed

✨ Features

• [agents]: Offer Claude 1M context per model from catalog max_input_tokens (#589)
• [skills]: Add codemie-assistant-builder skill and sdk assistants test tooling (#592)

🐛 Bug Fixes

• [agents]: Keep session cost visible in statusline with long branch names (#597)
• [analytics]: Cut Desktop telemetry poll work and restore Cowork cost attribution (#595)
• [agents]: Make statusline session cost match the analytics report (#594)

🔧 Maintenance

• [tests]: Keep TC-029 setup wizard from writing the real global config (#593)

Full Changelog: v0.15.5...v0.15.6