chore(main): release 0.20.0

[jorisjonkers-dev-agents]

🤖 I have created a release beep boop

0.20.0 (2026-09-17)

Features

• agents: clone a Repo-backed Workspace in-container over the credential socket (#74) (5662b1e)
• agents: drive Workspace to Ready or Failed with a reason (#75) (8c518f5)
• agents: drop the legacy Conversation/Message model (#82) (92c5cc0)
• agents: mint workspace-scoped git tokens over a unix socket (#73) (16b90d6)
• agents: run a Shell Agent Session in tmux inside the api container (#72) (fee09f9)
• image: build the agents image with baked tools and separate api and agent users (#70) (dab4901), closes #61

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