[5.1] Version bump v1.0.0, create Git tag

[underscorekadji]

Milestone: 5 – Release
Size: S (≤ 2 hours)
Labels: release

Description

Version bump to v1.0.0 and create Git tag for the first official release.

Acceptance Criteria

• Version bumped to v1.0.0 in package.json
• Git tag v1.0.0 created
• Tag properly annotated with release information
• All features completed and tested
• Release preparation checklist completed

Definition of Done

• PR reviewed & merged
• GitHub Actions pipeline passes (lint → build → smoke)