fix: inverted loop condition in chaos_machine.py prevents execution

[aeyjeyaryan]

Describe your change:

Fixes an inverted while-loop condition in hashes/chaos_machine.py that prevented the output-pulling loop from ever executing.

• Fix a bug or typo in an existing algorithm?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
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Summary of changes

Bug fix: The while-loop condition on line 98 was while inp in ("e", "E"):. Since inp is initialized as "", the loop never executed. Changed to while inp not in ("e", "E"):.

Additional improvements:

• Added type hints to all functions (push, pull, reset)
• Added a module-level docstring with references
• Added docstrings with doctests to pull()
• Fixed reset() to copy K with K.copy() instead of aliasing it (buffer_space = K), preventing mutation of the constant initial state on repeated reset() calls
• Replaced deprecated typing.List with built-in list

All checks pass: ruff, ruff format, mypy, and doctest.

[cclauss]

@priya-sundaram-dev, please review.

[priya-sundaram-dev]

Thanks @cclauss — reviewed. Mixed bag here; the title oversells and there's some dead code, but there's one genuinely good fix buried in it.

Title is inaccurate. The PR is titled "inverted loop condition ... prevents execution," but the diff doesn't change any loop condition — both for _ in range(t) loops in push()/pull() are byte-for-byte identical to main. Nothing about execution was broken or fixed on that front. The title should be corrected to describe what actually changed (docs + the reset fix below).

The real, worthwhile fix: buffer_space = K.copy() in reset(). On main, buffer_space = K aliases the module-level constant K, so push()/pull() mutate K in place — meaning a second reset() doesn't restore the original state. .copy() fixes that. Good catch, worth keeping.

Dead code to remove: the new nested def xorshift(x, y) inside pull() is never called — the inline Xorshift below (x ^= y >> 13 ...) still does the actual work. Either wire it up (x = xorshift(x, y)) or drop it; as written it's confusing duplication.

Nice: the added docstrings + doctests are welcome and pass locally.

Net: if the author (1) fixes the title, (2) removes or wires-up the unused xorshift, and keeps the K.copy() fix + docs, this becomes a clean small improvement. Not much test loss here — this one's fine to shepherd in once tidied.