Add multi-format build targets, conditional exports map, and automatic headless entry point for Node.js

[Copilot]

The package previously shipped a single dist/index.js CJS bundle with no exports map, no ESM target, and no ergonomic headless support for server-side consumers.

Changes

package.json

• Replaces "main": "dist/index.js" with four Parcel 2 targets:
  • "main" → dist/westures.cjs.js (CJS, Node ≥12)
  • "module" → dist/westures.esm.js (ESM, tree-shaking)
  • "browser" → dist/westures.umd.js (IIFE global window.westures)
  • "nodeHeadless" → dist/westures.node.cjs.js (headless CJS — required by Parcel as the output path for the custom target)
• Adds "exports" conditional map; "node" condition is ordered first so all Node.js consumers (both require and import) receive the headless build automatically:

  "exports": {
    ".": {
      "node":    "./dist/westures.node.cjs.js",
      "import":  "./dist/westures.esm.js",
      "require": "./dist/westures.cjs.js",
      "browser": "./dist/westures.umd.js"
    }
  }

• Adds "targets" block with outputFormat, isLibrary, optimize, and engines per target; the nodeHeadless target overrides "source" to point at index.headless.js.

index.headless.js (new)

Thin re-export of index.js with a Region subclass that defaults headless: true. Users can still opt out per-region with { headless: false }.

// Node.js — headless is automatic, no code change needed
const { Region, Pan } = require('westures');
const region = new Region(); // headless: true by default

// Override when a DOM is available
const domRegion = new Region(element, { headless: false });

README.md

Adds an "Installation & Import" section documenting all three consumption patterns: bundler (ESM), <script> tag (UMD), and Node.js headless (CJS).

CHANGELOG.md

Adds v1.2.0 entry.

[Copilot]

Pull request overview

This PR modernizes the published package interface by adding multiple Parcel build targets (CJS/ESM/UMD), introducing a conditional exports map, and adding a Node-oriented headless entry point that overrides Region defaults. It also updates documentation and the changelog to reflect the new consumption patterns.

Changes:

• Add Parcel targets for CJS (main), ESM (module), global/UMD (browser), and a custom Node headless CJS target.
• Add exports conditional mapping to select bundles by environment.
• Add index.headless.js entry and document install/import patterns in README.md, with a new changelog entry.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
README.md	Adds “Installation & Import” docs and Node headless usage guidance.
package.json	Introduces multi-target outputs and a conditional exports map.
index.headless.js	Adds a headless Node entry that re-exports everything and overrides Region default options.
CHANGELOG.md	Adds a new 1.2.0 release entry describing these distribution changes.

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