Extract the Sandbox trait, types, and all sandbox implementations from
fabro-agent and four separate crates (fabro-exe, fabro-ssh, fabro-sprites,
fabro-daytona) into a single fabro-sandbox crate. This cleans up the
dependency graph — implementation crates no longer pull in the full
fabro-agent just for the trait.
The new crate uses feature flags (local, docker, ssh, exe, sprites,
daytona, test-support) to gate each implementation. The shell_quote()
helper is unified into a single shared implementation, eliminating four
duplicate copies.
fabro-agent now re-exports all sandbox types from fabro-sandbox for
backward compatibility. The four absorbed crates are removed.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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