Minimum 2 tests per command, pre-commit hook

[jakethedev]

Now that #59 is done, lets enhance the test harness for real here.

First thing first

• [ ] pre-commit hook to npm test per commit

Checklist per command folder

• [ ] battle
• [ ] discord
• [ ] feedback
• [ ] giftex
• [ ] music
• [ ] sys

Outside of commands

• [ ] util
• [ ] standard battle scenario testing
• [ ] standard feedback testing