This PR prepares the release 1.13.6.

Summary by cubic

Prepares the 1.13.6 release by bumping version fields and syncing the internal VERSION constant. No functional changes.

Description

• Bump version to 1.13.6 in package.json, package-lock.json, bower.json, and lib/env/data.js.
• Keep runtime VERSION in sync with published package.
• Minor formatting adjustments only.

Testing

• No tests added or changed.
• No new tests needed; change is metadata-only. Verify built artifacts and reported version show 1.13.6.

^{Written for commit efbeb85. Summary will update on new commits.}