fix: floating-point equality, unused param, duplicate calls, stdout safety, missing test

[Xenon010101]

Summary

Fixed 6 bugs:

1. is_one_one.py — Floating-point equality (== 1) fails on IEEE 754 rounding; use math.isclose
2. is_one_one.py — Unused parameter Anik_one(a) immediately overwritten
3. is_one_one.py — Duplicate function call (is_one_using_interdimensional_tax_fraud called twice instead of Anik_one)
4. is_one_one.py — Same duplicate in main()
5. test_core.py — Unsafe sys.stdout buffer reassignment (data loss risk on Windows)
6. test_core.py — Missing test for Anik_one (added)

[github-actions]

✅ Logic Verified!

The Automated Logic Suite has confirmed that 1 is still 1.

• Environment: Ubuntu-latest
• Status: Mathematical Sanity Confirmed

You are safe to merge this chaos.

[itsdakshjain]

thanks for contribution @Xenon010101 , if you are genuinely doing code cleanups, there are more you can do in these files...otherwise i willl merge it upon your response as it is