Add CLI tool for one-shot game list fetch

[skypher]

Summary

Add a simple Python CLI wrapper (gamelist_cli.py) that:

• Runs the devilutionx-gamelist binary
• Waits for results (configurable timeout, default 25s)
• Outputs human-readable format or raw JSON
• Cleans up automatically on exit
• Provides helpful error messages and documentation

Usage

# Basic usage
./gamelist_cli.py

# Example output:
# Found 1 game(s):
#
# XRUAR: Hellfire 1.5.5 Fastest Normal (RiT, Theo, Cow) - Alexandria

# Verbose (show IPv6 addresses and binary output on timeout)
./gamelist_cli.py -v

# Output raw JSON
./gamelist_cli.py -j

# Custom timeout
./gamelist_cli.py -t 40

Test plan

• mypy passes
• Manual testing with live games

[skypher]

mypy CI fix here: #60

[AJenbo]

It's fine to include multiple changes in a PR by splitting them up in commits