Add codespell config, CI, and typo fixes

[yarikoptic]

Add codespell configuration, a GitHub Actions workflow that runs it on push and PRs, and fix all existing typos it flags.

More about codespell: https://github.com/codespell-project/codespell

I've introduced codespell to a hundred-plus projects with mostly positive feedback (see the improveit-dashboard overview). The CI job runs with permissions: contents: read only, so it's safe.

Changes

Configuration & CI

• .codespellrc with skip patterns and a domain whitelist.
• .github/workflows/codespell.yml running on push / pull_request to main, using the pinned codespell-project/actions-codespell@v2.2 action.

Skip patterns

• *.pb, optimized_models/ — serialized Keras/TF model weights that codespell fails to decode.
• .git, .git-meta, .gitignore, .gitattributes, .codespellrc — infrastructure.

Whitelisted words (ignore-words-list)

• momento — Spanish word ("moment") in a Spanish-language comment in rippl_AI.py; codespell would otherwise "correct" it to memento.
• commun — abbreviation of Communications in the Nature Commun Biol journal reference in the README.

Typo fixes

3 ambiguous typos fixed manually (context-dependent choice)

File	Before	After	Rationale
README.md:276	explotation	exploitation	"further exploitation of this toolbox" — module named "exploration" is separate
aux_fcn.py:555	precission	precision	ML metric, not percussion / precession
examples_explore/example_XGBOOST.ipynb	update te predictor	update the predictor	Article, not be/we/to

~70 non-ambiguous typos fixed via codespell -w

Fixed via datalad run 'codespell -w' (a reproducible commit — the exact command is recorded in the commit metadata). Representative fixes:

• Artifical → Artificial
• respository → repository
• senstive → sensitive, postive → positive
• miliseconds → milliseconds (×7)
• begining → beginning (×7)
• enviroment → environment (×5)
• arquitecture → architecture, oficial → official, sesion → session (Spanish-speaker English typos across notebooks)
• proccessed → processed, simutaneously → simultaneously, lamda → lambda
• hapenning → happening, supossedly → supposedly
• wont → won't, Cant → Can't, viceversa → vice-versa

Follow-up fixes to codespell's own output

• aux_fcn.py:677,682 — codespell -w rewrote Cant → Can't inside single-quoted string literals, which broke Python syntax (SyntaxError: unterminated string literal). Switched the outer quotes to double so the contraction parses. This is a real bug in the tree that was masked by the fact that these branches are error paths.
• aux_fcn.py:1211 — dont → don't in a comment; not caught by the default codespell dictionaries (clear + rare), surfaced by a follow-up --builtin clear,rare,usage,code,names review pass and fixed by hand.

Historical context

git log --all --grep=typo finds 8 prior typo-fix commits, so typo drift is a recurring maintenance burden here — automated checking should reduce that friction going forward.

Testing

• codespell passes with zero errors on the branch tip.
• python3 -c "import ast; ast.parse(...)" on aux_fcn.py and rippl_AI.py — both parse (verifies the Can't-in-single-quotes SyntaxError from codespell -w was caught and fixed).

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