fix(ci): restructure release workflow and bump to v1.2.0

[ajag408]

Summary

Fixes release workflow failures and bumps version to 1.2.0.

Problems

1. Immutable release: Parallel binary jobs race to create/upload to the same release. First job publishes it, remaining jobs fail with "Cannot upload assets to an immutable release"

Solution

1. Artifact-based release: Binary jobs upload to GitHub Actions artifacts. A new create-release job waits for all builds, then creates a single release with all assets
2. Version bump: 1.2.0 (clean slate — 1.1.0, 1.1.1, 1.1.2 all had failed releases)

Testing

• Local darwin-x64 binary build verified

[Copilot]

Pull request overview

Restructures the GitHub Actions release workflow to avoid parallel jobs racing to upload release assets, and bumps the npm package version to 1.2.0.

Changes:

• Bump package.json version to 1.2.0.
• Switch binary publishing from per-matrix-job release uploads to per-matrix-job artifact uploads.
• Add a single create-release job to download artifacts and create the GitHub Release with all assets.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
package.json	Version bump to 1.2.0 for the next release.
.github/workflows/release.yml	Reworks release asset publishing to use artifacts + a single release creation job.

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