Fix #89: Escape curly braces in context before str.format() in synthesis

[fazalpsinfo-cmyk]

Description

Fixes #89 - both question_gen.py and adversarial.py use str.format() to inject document context into prompt templates. If the context contains { or } characters (common in code snippets, JSON, markdown tables, template strings), Python's str.format() interprets them as format placeholders and raises a KeyError.

This makes the synthesis module crash on any real-world corpus that contains structured text with curly braces.

Changes

• Wrapped context text with .replace("{", "{{").replace("}", "}}") before passing to .format() in:
  • synthesis/question_gen.py (standard question generation)
  • synthesis/adversarial.py (all 5 adversarial types)

Related

Fixes #89

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