Add codespell support with configuration and fixes - #15399

Config updates:
- Add .git-meta to skip list (PR/commit message drafts often quote typos)
- Add ignore-regex for URLs (upstream URLs with typos should not be changed)
- Add ignore-words-list for variable names, magic commands and domain terms:
  ans/strng/dne (variable abbreviations), whos (%whos magic command),
  crasher/defaulty/matchin/promptin (function/parameter/attribute names),
  abd/fo/te/whe (test fixture strings), notin (ast.NotIn node name),
  buss/tham (contributor names), oktober (German in quoted email),
  mis ((mis)type parenthetical), reenable (valid non-hyphenated form)

Manual typo fixes (ambiguous or context-dependent):
- debugger.py: Toke -> Token in TODO comments (ambiguous: Token vs Took)
- github-stats-0.12.rst: trailling -> trailing (context = "trailing spaces")
- github-stats-0.13.rst: lastest -> latest (context = tornado version)
- filters.py: re-used -> reused (style fix in comment)
- release_helper.sh: fo -> for (context = "necessary for building")
- wrapperkernels.rst: re-use -> reuse (style fix)
- test.yml: mirros -> mirrors (context = CI mirror list)

Co-Authored-By: Claude Code 2.1.274 / Claude Sonnet 4.6 <[email protected]>

Fixed typos (all single-suggestion, no ambiguity):
- gloabl -> global (pyproject.toml)
- EXPLICT -> EXPLICIT (pyproject.toml)
- canot -> cannot (IPython/core/doctb.py)
- especialy -> especially (IPython/core/guarded_eval.py)
- manger -> manager (IPython/core/history.py)
- specied -> specified (IPython/external/pickleshare.py)
- themeing -> theming (IPython/terminal/interactiveshell.py)
- implict -> implicit (tests/test_completer.py)
- re-declaring -> redeclaring (tests/test_magic.py)
- itsel -> itself (.github/ISSUE_TEMPLATE.md)
- quikly -> quickly, inputed -> inputted, ususal -> usual (docs/version7.rst, version9.rst)
- evaulation -> evaluation, multline -> multiline, non-existant -> non-existent (docs/github-stats-0.11.rst)
- doen't -> doesn't (docs/github-stats-0.12.rst)
- pyhton -> python, unhandeled -> unhandled, inoperant -> inoperative,
  imput -> input (docs/github-stats-0.13.rst)
- annoted -> annotated, thansk -> thanks, restuctured -> restructured,
  non-existant -> non-existent, undefinied -> undefined,
  transfomers -> transformers, ouside -> outside, unexpectly -> unexpectedly,
  execption -> exception, incompatibilty -> incompatibility, easyer -> easier,
  Sliently -> Silently, dashboad -> dashboard, disconect -> disconnect (docs/github-stats-1.0.rst)
- atleast -> at least, aligment -> alignment, shorcuts -> shortcuts,
  defauts -> defaults, comparission -> comparison, Case-insesitive -> Case-insensitive,
  verion -> version, annoted -> annotated, Buitlin -> Builtin (docs/github-stats-2.0.rst)
- Loder -> Loader (docs/github-stats-4.rst)

Co-Authored-By: Claude Code 2.1.274 / Claude Sonnet 4.6 <[email protected]>

=== Do not change lines below ===
{
 "chain": [],
 "cmd": "uvx codespell -w",
 "exit": 0,
 "extra_inputs": [],
 "inputs": [],
 "outputs": [],
 "pwd": "."
}
^^^ Do not change lines above ^^^

- codespell.yml: update actions/checkout@v6 to pinned SHA v7 (consistent
  with other workflows in this repo)
- .pre-commit-config.yaml: fix comment to say config is in pyproject.toml
  (not .pre-commit-config.yaml); add tomli dependency for Python < 3.11
  so the hook can read [tool.codespell] from pyproject.toml

Co-Authored-By: Claude Code 2.1.274 / Claude Sonnet 4.6 <[email protected]>

The whatsnew/ directory contains auto-generated github-stats-*.rst files
whose content (PR titles, commit messages) should not be spell-corrected —
those are historical records of upstream text. The hand-written version*.rst
release notes are also skipped to be consistent: their typos, if any, belong
to the historical record as well.

Revert the typo fixes previously applied to files in that directory
(they were already committed in the prior datalad run; this reverts them).

Also fix the fnmatch skip pattern: codespell prefixes scanned paths with
"./" when running from the repo root, so the pattern must use
"./docs/source/whatsnew/*" to match correctly.

Co-Authored-By: Claude Code 2.1.274 / Claude Sonnet 4.6 <[email protected]>