Move the reserved-word, reserved-global, reserved-error-member, and dunder exclusion sets from the worker backend up to the code-runtime seam package, and narrow the portable identifier subset to drop the JS-only `$`. Every backend now imports one contract so a binding namespace list valid on one backend is valid on all. Delivers only the seam extension and the worker's adoption; the Python backend, py-types renderer, and Code Mode language dispatch are later PRs in the stack that depend on these exports.
code-runtime/ — code-execution capability family
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The code-execution capability seam (see capability seams): an abstract runtime interface for executing one model-written program against host-provided async bindings, capturing what it printed and returned. The consumer is the tool registry's Code Mode (tools: { mode: code } — the run_code tool and the generated TypeScript SDK); design in the Code Mode Agent Note. Product packages.
| Package | Role | ctx key |
|---|---|---|
code-runtime/ |
Code-execution seam and shared vocabulary | ctx.codeRuntime |
code-runtime-worker/ |
Worker-thread backend | registers ctx.codeRuntime |
Backends register the seam without changing its consumer. The child READMEs own language, isolation, and execution-budget details.