Remove unused 'import math' in main.py

[anxkhn]

Context

The file app/main.py imports the math module at the top, but it is never used anywhere in the file. Unused imports add clutter and can confuse readers about what dependencies the module actually has.

Steps to reproduce

1. Open app/main.py.
2. Find line 7: import math
3. Search the file for any usage of math. -- there are none.
4. If you have a linter like flake8 or ruff, it will flag this:

   pip install ruff
   ruff check app/main.py

   Output: F401 'math' imported but unused

Expected behavior

Only modules that are actually used should be imported.

Actual behavior

import math is present but never used.

Files

• app/main.py -- line 7

Acceptance criteria

• The import math line is removed from app/main.py
• All tests still pass: pytest tests/ -v
• No other imports are modified

Suggested approach

1. Open app/main.py.
2. Delete the import math line.
3. Run pytest tests/ -v to verify nothing depended on it.