[5.2] Draft GitHub Release (notes, changelog)

[underscorekadji]

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

Description

Draft GitHub Release with release notes and changelog for v1.0.0.

Acceptance Criteria

• GitHub Release created for v1.0.0
• Comprehensive release notes written
• Changelog documenting all features
• Breaking changes documented (if any)
• Installation and upgrade instructions
• Known issues documented

Definition of Done

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