🔒 Fix Insecure YAML Deserialization in Scripts

[hahwul]

🎯 What: The vulnerability fixed is an insecure YAML deserialization using YAML.load in scripts/validate_weapons.rb and scripts/erb.rb.
⚠️ Risk: If an attacker can introduce a malicious YAML file into the weapons/ directory, the old YAML.load method in earlier Ruby versions allows instantiation of arbitrary Ruby objects, potentially leading to Remote Code Execution (RCE) when the scripts are executed.
🛡️ Solution: The fix replaces YAML.load(File.open(...)) with YAML.safe_load_file(...), which is safe against instantiating arbitrary classes and only parses safe, native types like Hashes, Arrays, and Strings by default.

Note: Since scripts/erb.rb re-read the directory indiscriminately without sorting, executing it generated a minor shuffling in some tables within README.md and categorize/ markdown files, which have been committed along with the fixes.

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PR created automatically by Jules for task 5666713803620845012 started by @hahwul

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