Nexus-Mods

Generate a new Vortex `CHANGELOG.md` entry from merged PRs since a given starting tag. Use this skill whenever the user invokes `/changelog`, asks to draft release notes, or wants to summarise PRs merged on a Vortex release branch (v2.0, v2.1, v2.2, etc.) into Added / Changed / Fixed bullets following Keep-a-Changelog 1.1.0. The skill auto-detects the source branch, fetches PR titles/bodies via `gh`, dedupes against the existing CHANGELOG, applies the project's exclusion rules (internal CI/infra, telemetry/OTel/Mixpanel, docs-only, low-impact dependency bumps), produces a draft for the user to review, and only writes after the user gives the go-ahead.