Revert "feat(sdlc-workflow): add release-notes skill" (#195)

[mrizzi]

Reverts #195, which was merged by mistake.

The same change will be reintroduced via a follow-up "revert the revert" PR once this is merged, so it can go through proper review before landing on main.

Summary by Sourcery

Chores:

• Remove the accidentally merged release-notes skill from the SDLC workflow plugin.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This revert removes the release-notes skill from the SDLC workflow plugin by deleting its SKILL.md file, with the functionality intended to be reintroduced later through a separately reviewed follow-up change.

File-Level Changes

Change	Details	Files
Remove the mistakenly merged release-notes skill from the SDLC workflow plugin.	Delete the 445-line skill definition and its associated workflow guidance. Restore the repository to the state before the release-notes skill was introduced pending a separately reviewed reintroduction.	plugins/sdlc-workflow/skills/release-notes/SKILL.md

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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