chore(eslint): enforce JSDoc block tag formatting

[github-actions]

Closes #307

Applied changes based on Issue #307.

I’ve added ESLint (with the TypeScript parser) and the eslint-plugin-jsdoc plugin to enforce:

• Each JSDoc block tag (@param, @returns, etc.) must be on its own line.
• A maximum line length of 80 characters (including comment text).

Changes:

• package.json
– Added a lint script
– Installed eslint, @typescript-eslint/*, eslint-plugin-jsdoc, and eslint-config-prettier as devDependencies

• .eslintrc.js
– Configures ESLint to use the TypeScript parser, includes the jsdoc plugin, and enables rules:
• jsdoc/check-multiline-blocks
• jsdoc/newline-after-description
• jsdoc/require-param
• jsdoc/require-returns
• max-len @ 80 chars

• .eslintignore
– Ignore node_modules and built/dist output

• README.md
– Documented the new npm run lint command under a “Linting” section

Now running npm install, then npm run lint will catch any JSDoc block tags on the same line or over-long comment lines. Let me know if you’d like any adjustments!