Update pre-commit hooks and ruff configuration

[david26694]

Config only, no source changes.

What

• black v25.1.0 -> v26.5.1, ruff v0.0.261 -> v0.16.3
• ruff.toml: move extend-select and ignore under the lint namespace, silencing the deprecation warning ruff emits on every run
• normalise .pre-commit-config.yaml indentation
• refresh uv.lock

Deliberately not included

Running the updated hooks also reformats source, mainly modernising type annotations (Optional[Any] -> Any | None, dropping Dict/List/Optional imports). That is left to a follow-up so this diff stays reviewable.

Until that follow-up lands, pre-commit run --all-files will report changes.

Known issue this does not fix

black and ruff format disagree about line length in this repo: ruff.toml sets 160, black uses its default of 88. Formatting on save with ruff while pre-commit runs black produces churn in both directions.

The most visible symptom is implicit string concatenation. ruff format joins

return (
    f"{type(self).__name__}: cluster_cols={self.cluster_cols}, "
    f"target={self.target_col}, treatment={self.treatment}"
)

into a single 130-character literal, which fits under 160. black cannot split it again, because merging the two literals removed the concatenation point, and E501 is ignored. So the change is one-way and sticks.

Worth settling separately, by aligning the two line lengths or dropping one of the formatters.

🤖 Generated with Claude Code

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.17%. Comparing base (b0a737a) to head (9d44145).
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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #272   +/-   ##
=======================================
  Coverage   95.17%   95.17%           
=======================================
  Files          18       18           
  Lines        2094     2094           
=======================================
  Hits         1993     1993           
  Misses        101      101           

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