ci: add Husky pre-commit hooks for lint and formatting

[AGWAM001]

Closes #227

Summary

Sets up Husky pre-commit and pre-push hooks with lint-staged to catch lint errors, formatting issues, and type errors locally before they reach CI.

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Changes

• Installed husky and lint-staged as dev dependencies
• Configured lint-staged to run eslint --fix and prettier --write on staged .ts/.tsx/.js/.jsx files on pre-commit
• Added a pre-push hook to run tsc --noEmit and catch type errors before push
• Documented setup and usage in CONTRIBUTING.md

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How to test

1. Pull the branch and run npm install to set up hooks
2. Stage a file with a lint or formatting issue and run git commit — the hook should auto-fix and block the commit if unfixable errors remain
3. Run git push on a branch with a TypeScript error — the pre-push hook should fail and prevent the push
4. Verify a clean commit + push completes in under 10 seconds

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Notes

• Hooks only run on staged files, keeping pre-commit fast for typical changes
• tsc --noEmit runs project-wide on push, not scoped to staged files, to ensure full type safety
• New contributors will need to run npm install after cloning to activate the hooks (documented in CONTRIBUTING.md)

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[Marvell69]

Please resolve conflict