Ship CommonJS build for librosa-wasm (0.1.3)

[olilarkin]

Makes @olilarkin/librosa-wasm ship a CommonJS/Node build alongside the existing ESM one, so any require() consumer (Electron main, plain Node, Ableton Extension Host) gets a working module with no manual conversion.

Two commits: the CommonJS build, and a separate Emscripten version bump.

CommonJS build

• scripts/make-cjs.mjs — scripted post-build step (pure JS, no Emscripten needed). It:
  • Converts the emscripten ESM glue → dist/wasm/librosa_wasm.cjs. The conversion handles both emscripten createRequire shim forms (static top-level import in 3.1.x, inline await import in 4.0.x), rewrites import.meta.url and export default, and then asserts no ESM construct survives — so a future emscripten upgrade fails the build loudly instead of producing a broken .cjs.
  • Emits dist/src/index.cjs by transforming the compiled ESM entry, so the arity table stays single-sourced from src/index.ts.
  • Generates dist/src/index.d.cts as a callable export = createLibrosa with a merged namespace re-exporting the function (and default) plus all type names (derived from types.d.ts). This matches the module.exports = createLibrosa runtime so import x = require(pkg) is callable under node16/nodenext.
• scripts/smoke.cjs — node:test smoke test that require()s the built CJS entry, instantiates the wasm, and computes.
• package.json — import/require conditions in exports (each with its own types); main → .cjs, module → .js; build:cjs/test:cjs wired into build/test. Version bumped to 0.1.3.
• README.md — documents require() usage.

The existing CI build/test steps already run npm run build and npm test, both of which now include the CJS conversion + smoke test, so no extra publish-workflow wiring was needed.

Emscripten bump (separate commit)

• Bumps all three workflows (ci, npm-publish, web-pages) from 3.1.61 → 4.0.22, the version the package + test suite were validated against locally. The conversion script is version-robust regardless, so this is a toolchain refresh rather than a fix.

Verification

• 32 ESM tests + 2 CJS smoke tests pass; CI green on Emscripten 4.0.22.
• Converted glue has zero ESM leftovers.
• CJS and ESM consumers type-check under module: NodeNext (incl. import x = require(pkg) callable).
• End-to-end require("@olilarkin/librosa-wasm") resolves through exports to the .cjs, loads the sibling wasm, and computes; ESM import path still works.
• npm pack includes index.cjs, index.d.cts, librosa_wasm.cjs, and the .wasm.

Once published, the downstream extension can drop its vendored .cjs and consume the package's CJS entry directly.

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