Naming alignment: build-cli skill, microsoft-build folder, fix repo URL

[mikekinsman]

Summary

Aligns naming across the repo per team discussion.

Changes

Layer	Before	After
Skill name (terminal)	build-companion	microsoft-build-cli
Skill folder	skills/microsoft-events/	skills/microsoft-build/
cli/package.json repo URL	pdebruin/microsoft-events-skill	microsoft/Build-CLI

What stays the same

Layer	Name	Reason
Plugin identity (plugin.json)	microsoft-events	Generic - reusable across events
npm package	@microsoft/events-cli	Generic - one publish, all events
Repo / install command	microsoft/Build-CLI	Already correct

Rationale

• Skill name: build-companion is not used in any messaging or docs. microsoft-build-cli matches the repo name, README, and marketing copy. Terminal will show: skill(microsoft-build-cli)
• Skill folder: microsoft-build clearly signals this is the Build-specific skill. The npm package (@microsoft/events-cli) stays generic because it is reused across events.
• Repo URL: Was pointing to a personal dev repo. Now points to the actual shipping repo.