chore(docs): resolve ruff lint and format in Friedland Ch. 7 Part 2 (#1216)

[priyam0k]

Summary of Changes

• Lowercased function names in Friedland Chapter 7 Part 2 to resolve N802 violations and formatted the notebook with ruff format.
• Removed docs/friedland/chapter_7_part_2.ipynb from per-file-ignores in pyproject.toml.

Related GitHub Issue(s)

• Resolves remaining Friedland files for Initial Linting Cleanup #1216

Additional Context for Reviewers

All pre-commit ruff checks pass cleanly and all notebook cells run and pass locally.

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
Documentation and lint/format only; no library API or runtime behavior changes beyond longer doc CI notebook timeouts.

Overview
Brings Friedland Chapter 7 Part 2 in line with ruff by renaming exhibit helpers to lowercase (ex3sht10, ex4sht1, ex4sht6, etc.) and reformatting notebook cells, then drops that notebook from pyproject.toml per-file-ignores for N802.

Docs build reliability gets a bump: notebook execution timeout rises from 30s to 180s in _config.yml and conf.py, and prep_sphinx_conf.py pre-warms the matplotlib font cache on fresh runners. conf.py also picks up quote/style reflow from regeneration; prep_sphinx_conf.py uses a looser _DOCS_EXT_DIR marker so re-runs stay idempotent.

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[github-actions]

Pyright Type Completeness

View the full pyright --verifytypes output for this commit

Project (full chainladder package, at this PR's head): 15.1% of exported symbols fully typed (208 / 1380)

	Known	Ambiguous	Unknown	Total
Project (head)	208	111	1061	1380

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: 327
• 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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.76%. Comparing base (6b51f64) to head (36568df).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1340   +/-   ##
=======================================
  Coverage   91.76%   91.76%           
=======================================
  Files          96       96           
  Lines        5475     5475           
  Branches      706      706           
=======================================
  Hits         5024     5024           
  Misses        327      327           
  Partials      124      124           

Flag	Coverage Δ
unittests	91.76% <ø> (ø)

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[henrydingliu]

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[henrydingliu]

what happens when something times out?

[priyam0k]

I think that screenshot with the KeyboardInterrupt is actually what happens when a cell times out

Jupyter Book kills any cell that takes longer than 30s. On RTD's fresh runner, building the font cache took just over 30s, so it interrupted the cell and skipped the rest of the notebook.

Upping the timeout to 180s gives it a safe buffer, and pre-warming the cache in prep_sphinx_conf.py fixes the slow cold start.