Correct personal site path in documentation

[VatsalSy]

Summary

• Correct the documented personal-site URL to match the configured Jekyll base path.
• Prevent readers from following the stale lowercase URL, which currently returns 404.

Changes

• Update AGENTS.md and README.md from /vatsalsy to /VatsalSy.
• Keep the documentation aligned with _config.yml (baseurl: "/VatsalSy").

Testing

• curl -L https://comphy-lab.org/vatsalsy/ returned HTTP 404 before this change.
• curl -L https://comphy-lab.org/VatsalSy/ returned HTTP 200.
• bundle exec jekyll build could not run because Bundler 2.5.23 is not installed on this checkout's macOS Ruby environment.
• git diff --check passed.

[Copilot]

Pull request overview

This PR updates repository documentation to reflect the correct, case-sensitive deployed path for the Jekyll site (baseurl: "/VatsalSy"), preventing readers from following a stale URL that returns 404.

Changes:

• Updated the documented personal-site URL from /vatsalsy to /VatsalSy in key docs.
• Kept documentation aligned with the configured Jekyll baseurl.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
README.md	Updates the documented hosted URL to the correct /VatsalSy path.
AGENTS.md	Corrects the hosted URL in the repository overview section to /VatsalSy.

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