chore: enforce pre-PR validation (aggregate scripts, git hooks, PR checklist)

.github/pull_request_template.md

@@ -5,5 +5,6 @@ Describe your changes.
 Add link to the related issue.
 
 **Check list:**
+- [ ] Ran `npm run check` locally (format, lint, build, test) and all checks pass.
 - [ ] Mark if documentation changes are required.
 - [ ] Mark if tests were added or updated to cover the changes.

.husky/pre-commit

@@ -0,0 +1 @@
+npx lint-staged

.husky/pre-push

@@ -0,0 +1 @@
+npm run build && npm test

docs/contributors.md

@@ -63,6 +63,17 @@ Pull requests are the easiest way to contribute changes to git repos at GitHub.
 - To lint the code, **you need to run the `lint:fix` script**
 - To transpile source code to `javascript` we use [NCC](https://github.com/vercel/ncc). **It is very important to run the `build` script after making changes**, otherwise your changes will not get into the final `javascript` build
 
+> [!TIP]
+> Instead of running each script individually, you can run the aggregate scripts:
+>
+> - `npm run fix` — formats, lints (with autofix) and rebuilds the `dist/` bundle.
+> - `npm run check` — runs the same validation as CI: `format-check`, `lint`, `build` and `test`. **Run this before pushing a pull request** to make sure it will pass the required checks.
+>
+> Git hooks are installed automatically when you run `npm install` (via [husky](https://typicode.github.io/husky/)):
+>
+> - a **pre-commit** hook formats and lints staged files with [lint-staged](https://github.com/lint-staged/lint-staged);
+> - a **pre-push** hook rebuilds `dist/` and runs the test suite.
+
 **Learn more about how to implement tests:**
 
 Adding or changing tests is an integral part of making a change to the code.