Refactor runtime execution for JavaScript backend - #27
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Replace the public shell execution surface with workspace.runtime and route command execution through stable backend IDs. The existing container and worker command backends keep the push/pull bracket while sharing one client, stub, and observation path. Document the runtime surface and update the examples to call workspace.runtime instead of workspace.shell.
Add a module backend that runs ECMAScript sources in Dynamic Workers with structured input, retained execution events, durable filesystem access, and host-owned git and artifact capabilities. Expose the backend on its own package subpath and cover it with unit and workerd integration tests.
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July 31, 2026 14:18
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Summary
workspace.shellexecution surface withworkspace.runtimecontainer-shellandisolate-shellbackendsisolate-javascriptbackend with durable modules, filesystem capabilities, lifecycle controls, and RPC projectionScope
This PR contains the runtime API and isolated backend only. The external Codemode adapter and example are stacked separately in #28. Existing release workflows, Docker policy, package publication, and unrelated example CI are unchanged.
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