[FIX] Apply Ruff fix to chainladder/development.

[genedan]

Summary of Changes

Stacked pull request on #1290. Ruff cleanup of chainladder/development files.

Related GitHub Issue(s)

#1216

Additional Context for Reviewers

Checklist

• I passed tests locally for both code (uv run pytest) and documentation changes (uv run --directory docs jb build . --builder=custom --custom-builder=doctest)

---

Note

Low Risk
Lint and formatting only in development estimators and tests; Munich renames are private methods with no reserving logic changes.

Overview
This PR Ruff-cleans the chainladder/development package and its unit tests so those modules meet the repo lint rules without per-file ignores.

Production code changes are almost entirely formatting and style: wrapped signatures, normalized quotes/spacing, docstring tweaks, removed unused imports (numpy in glm.py, unused Development/pandas in incremental.py, unused sklearn preprocessors in learning.py), and small idiomatic fixes such as not X.is_cumulative and weighted_step is None in DevelopmentML. Clark growth helpers _G / G_ keep their names with # noqa: N802; Munich private helpers are renamed _get_MCL_* → _get_mcl_* with call sites updated—no public API change.

Tests are reformatted similarly, with minor lint fixes (e.g. bare except → except Exception, pytest B018 assignments to _, dropping an unused xerror variable).

pyproject.toml drops the Ruff per-file-ignores entries for the cleaned development modules and tests, so those paths are now held to the full rule set.

^{Reviewed by Cursor Bugbot for commit c55a03a. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

Pyright Type Completeness

View the full pyright --verifytypes output for this commit

Project (full chainladder package, at this PR's head): 14.9% of exported symbols fully typed (204 / 1369)

	Known	Ambiguous	Unknown	Total
Project (head)	204	111	1054	1369

Other symbols referenced but not exported by chainladder: 13

	Known	Ambiguous	Unknown	Total
Other (head)	3	1	9	13

Symbols without documentation:

• Functions without docstring: 325
• Functions without default param: 0
• Classes without docstring: 10

Patch (exported symbols added or changed by this PR): no exported symbol type-completeness changes detected.

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.69%. Comparing base (7bd6da7) to head (c55a03a).

Files with missing lines	Patch %	Lines
chainladder/development/barnzehn.py	60.00%	3 Missing and 1 partial ⚠️
chainladder/development/learning.py	91.17%	2 Missing and 1 partial ⚠️
chainladder/development/incremental.py	90.00%	0 Missing and 1 partial ⚠️
chainladder/development/tests/test_development.py	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           gd_ruff_fix_plots    #1294      +/-   ##
=====================================================
- Coverage              91.69%   91.69%   -0.01%     
=====================================================
  Files                     96       96              
  Lines                   5456     5453       -3     
  Branches                 702      702              
=====================================================
- Hits                    5003     5000       -3     
  Misses                   328      328              
  Partials                 125      125              

Flag	Coverage Δ
unittests	91.69% <88.88%> (-0.01%)	⬇️

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