fix: sync package.json version with VERSION file

[Gonzih]

Problem

package.json shows version 0.15.0.0 but VERSION file contains 0.15.1.0. These are out of sync.

This means npm show gstack version (if published), package.json version checks, and any tooling that reads package.json see the wrong version. Closes #399.

Fix

Updated package.json "version" field to match the canonical VERSION file: 0.15.1.0.

Notes

The VERSION file is the source of truth (used by gstack-update-check, CHANGELOG headers, etc). package.json should always mirror it. The /ship skill's idempotency check already guards against double-bumping VERSION — but it should also update package.json to keep these in sync after each bump.

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sent from mStack