[openApiDiff.ts] Replace exec with execFile

[mikeharder]

• fixes Path strings should be quoted or have whitespace escaped #254

[mikeharder]

unrelated unused import

[Copilot]

Pull Request Overview

This PR replaces the use of child_process.exec() with execFile() to improve security by eliminating shell command injection vulnerabilities. The change removes the need for manual shell argument escaping and simplifies command execution.

• Replaced exec with execFile in openApiDiff.ts for safer command execution
• Removed shell-quote dependency and related escaping logic
• Restructured command building to use argument arrays instead of shell strings

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

File	Description
src/lib/validators/openApiDiff.ts	Replaced exec with execFile, removed shell escaping functions, restructured command building
src/test/shellEscapingTest.ts	Removed entire test file as shell escaping is no longer needed
package.json	Removed shell-quote dependency and its type definitions
CHANGELOG.md	Added entry documenting the change to execFile

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