Rename skill from microsoft-build-cli to microsoft-build

Per the Agent Skills spec (agentskills.io/specification), the skill
name must match the parent directory name. The folder is already
skills/microsoft-build/, so the name should be microsoft-build.

Also: users ask 'What's new at Build for my project?' — the agent
activates on 'build' in the description, not 'cli'. The -cli suffix
adds no discovery value and violates the spec.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: pdebruin

skills/microsoft-build/SKILL.md

@@ -1,5 +1,5 @@
 ---
-name: microsoft-build-cli
+name: microsoft-build
 description: >-
   Your companion for Microsoft Build 2026. Helps you find sessions relevant to
   your project, discover what's new for your tech stack, scaffold projects from