release: prepare v4.1.0 release

[callinmullaney]

Summary

Prepares the Emulsify Core v4.1.0 release by promoting the completed develop changes to main.

Release highlights:

• Adds configurable asset roots through assets.roots in project.emulsify.json.
• Preserves assets/ and src/assets/ as default asset locations.
• Mounts configured asset roots at /assets in Storybook.
• Resolves Twig source('@assets/...') references against configured asset roots.
• Safely ignores asset roots outside the project and reports them through emulsify-audit.
• Automatically discovers accessibility targets from the built Storybook index.json.
• Merges discovered story IDs with manually configured Pa11y targets.
• Adds discoverStories: false for projects that require a manual accessibility target list.
• Preserves the full Storybook context through preview decorators, including args, loaded, parameters, and globals.
• Maintains compatibility with React stories and legacy Twig stories that return HTML strings.
• Updates documentation for asset roots, accessibility discovery, Storybook behavior, and platform-neutral WordPress and Timber projects.
• Adds regression coverage for project configuration, asset resolution, auditing, accessibility discovery, and Storybook decorators.

Related issue(s)

• N/A
• Related work: feat(config): support custom Twig asset roots #268 and feat: improve consumer packaging and Storybook integration #270
• Version metadata: chore(release): bump version to 4.1.0 #267

Checklist

• Tests run and results noted — CI completed successfully.
• Documentation impact considered — relevant documentation has been updated.
• Migration or backward compatibility impact considered — existing asset roots and manual accessibility configuration remain supported.
• Accessibility impact considered — Storybook accessibility checks now discover built stories by default.
• Release fixture impact considered — no release fixture changes are required.

Notes

• Custom asset roots are additive; existing projects do not need to update their configuration.
• Configured asset roots must resolve within the project root.
• Automatic accessibility discovery may check stories that were previously absent from the manual target list and may expose additional findings.
• Projects can set discoverStories: false to retain manual-only Pa11y targeting.
• No breaking changes are expected for existing Storybook, Twig, React, or Drupal projects.

[github-actions]

🎉 This PR is included in version 4.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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