docs: add migrate-v5-experimental-router skill

[posva]

Agent skill to migrate apps to file-based routing, the experimental router, param parsers, and scroll restoration.

[netlify]

✅ Deploy Preview for vue-router ready!

Name	Link
🔨 Latest commit	2d95645
🔍 Latest deploy log	https://app.netlify.com/projects/vue-router/deploys/6ac90fae60060400075690a5
😎 Deploy Preview	https://deploy-preview-2841--vue-router.netlify.app
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Lighthouse	1 paths audited Performance: 89 (🔴 down 1 from production) Accessibility: 97 (no change from production) Best Practices: 100 (no change from production) SEO: 92 (no change from production) PWA: - View the detailed breakdown and full score reports

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[pkg-pr-new]

Open in StackBlitz

pnpm add https://pkg.pr.new/vue-router@2841

npm i https://pkg.pr.new/vue-router@2841

yarn add https://pkg.pr.new/vue-router@2841.tgz

commit: 2d95645

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.27%. Comparing base (0729ce7) to head (2d95645).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2841   +/-   ##
=======================================
  Coverage   88.27%   88.27%           
=======================================
  Files          78       78           
  Lines        6305     6305           
  Branches     2070     2047   -23     
=======================================
  Hits         5566     5566           
  Misses        650      650           
  Partials       89       89           

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