Add CI workflow for PR validation

[Copilot]

PRs currently have no automated checks. This adds CI validation to ensure code quality before merge.

Changes

package.json

• Added lint script using tsc --noEmit for type checking without build artifacts

.github/workflows/pr-checks.yml

• Triggers on pull_request events (opened, synchronize, reopened)
• Runs lint, build, and test sequentially on Node.js 18
• Uses npm ci for reproducible dependency installation
• Sets permissions: contents: read (least privilege)

The workflow blocks PRs with type errors, build failures, or test failures.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Lint and build PRs must work before PR is merged</issue_title>
<issue_description>Github workflows must run lint and build scripts for all PRs every time they are updated</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Lint and build jobs must work before PR is merged #3

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[Copilot]

Pull request overview

Adds CI validation to ensure pull requests pass TypeScript type-checking, build, and Jest tests before merge, aligning with the repo’s goal of catching issues early in PRs.

Changes:

• Added a lint npm script that runs tsc --noEmit for TypeScript type-checking.
• Introduced a GitHub Actions workflow to run lint, build, and test on pull_request events.
• Configured the workflow to use Node.js 18 with npm dependency caching and minimal contents: read permissions.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
package.json	Adds a lint script for TypeScript type-checking without emitting build artifacts.
.github/workflows/pr-checks.yml	Adds PR-triggered CI job to install deps and run lint/build/tests with secure permissions.

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