Add variable composition templates#118
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Port the Python SDK variable composition work into the JS SDK: managed variable references can compose with @{...}@ syntax, template variables render runtime Handlebars inputs, and validation/push paths understand template input schemas.
Also adds focused composition/template validation tests, docs, the Node example, and a changeset so the public API change is tracked.
![devin-ai-integration[bot]](https://avatars.githubusercontent.com/in/811515?s=60&v=4){kind=small}
The composed_from span attribute is the only piece of composition metadata that crosses the SDK boundary into trace exporters. Python emits a flat, snake_cased projection per top-level reference; the JS SDK was stringifying the full ComposedReference tree, which both duplicated potentially large `value` payloads onto every resolution span and used a camelCase nested key, so any consumer walking the chain across SDKs would see a different shape. Project the same five fields (name, version, label, reason, error) Python emits, and drop the recursive nesting so the wire format matches across SDKs.
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Summary
@{variable}@references, dotted field reads, block-helper control flow, nested composition metadata, and cycle/depth protection.ResolvedVariable.render()andtemplateVar()for one-step composition, runtime input rendering, and parsing.template_inputs_schemain local config, validation, sync/write bodies, docs, examples, and release notes.Why
This ports the Python SDK variable composition/template behavior into the JavaScript SDK so managed variables can share reusable fragments, preserve runtime
{{...}}placeholders, and validate template inputs before pushing remote configs.Validation
pnpm run check