boa-cat 0.4.0

Tree-walking ECMAScript interpreter built on ecma-syntax-cat. v0.4.0 opens the async track (chunk 1 of 5-7): adds a `Value::Promise(PromiseId)` variant + heap-stored `PromiseState::{Pending, Resolved, Rejected}` + synchronous `.then` / `.catch` dispatch with chained-promise return values. Embedders build promises from Rust via `Heap::alloc_promise(state)` -- a JS-side `Promise.resolve` / `reject` / `all` / `race` constructor surface lands in ecma-runtime-cat 0.3 once boa-cat 0.5 ships `await` and the microtask driver.
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boa-cat

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This release does not have any feature flags.