1.4.0 cleans up graph helpers.
Changes:
- fixed factors() to return all factors instead of only the first one
- added slopeFromPoints as a readable alias for m
- added quadraticFormula as a readable alias for quad
- aligned TypeScript declarations with actual graph helper behavior
- expanded graph tests, including complex roots
Validation:
- npm test
- npm pack --dry-run
- npm publish via v1.4.0 tag