feat : Added-svg-generation

[Avan14]

Add generate_svg function

Closes #40

Changes

• Added generate_svg() to core.py — generates PDF first, then converts to SVG using pdf2svg, Inkscape, or pdftocairo (tried in order)
• Added --svg flag and --output=*.svg support in commandline()
• Added --svg CLI handler and help text in cli.py
• Exported generate_svg in __init__.py
• Added SVG install instructions and usage examples to README.md
• Added 6 new tests in test_drawtree.py (4 generation + 2 commandline)
• Updated Readme

Usage

CLI

draw_tree games/example.ef --svg                # Creates example.svg
draw_tree games/example.ef --output=mygame.svg  # Creates mygame.svg

Python API

from draw_tree import generate_svg
generate_svg('games/example.ef')
generate_svg('games/example.ef', save_to='mygame', scale_factor=0.8)

Tests

All 61 tests in test_drawtree.py pass (6 new + 55 existing).

Note: Submitting this as part of my GSoC 2026 application for Project 2 (GameInterpreter), as suggested in the outreach email.