fix!(lua.utils): gamestate enhancement field uses localized text instead of stable key

**Ref:** PR #190

## Description

After adding an enhancement to a playing card, the `modifier.enhancement` field in the gamestate response contains the localized text from `card.ability.effect` (e.g. `"BONUS"`) instead of a stable identifier. This breaks any automation that depends on reading the enhancement type, especially in non-English locales.

## Steps to Reproduce

1. Start a run
2. Add a playing card with an enhancement: `add({"key": "H_A", "enhancement": "BONUS"})`
3. Inspect the gamestate response

## Expected Behavior

`modifier.enhancement` should contain a stable, locale-independent key (e.g. `"m_bonus"`).

## Actual Behavior

`modifier.enhancement` contains `"BONUS"` — derived from the English string `"Bonus Card"` via `:gsub(" Card", "")`. This breaks in other languages.

## Environment

- **OS:** macOS
- **Lovely version:** 0.8.0
- **SMODS version:** v1.0.0~BETA-1221a
- **BalatroBot commit:** 084044e

## Files

- [60006.log](https://github.com/user-attachments/files/28841794/60006.log)
- [60006.req.jsonl.txt](https://github.com/user-attachments/files/28841795/60006.req.jsonl.txt)
- [60006.res.jsonl.txt](https://github.com/user-attachments/files/28841793/60006.res.jsonl.txt)