Drop type:ignore comments made unused by argcomplete 3.7

[Carreau]

Summary

The Test Lint job on main has been failing: argcomplete 3.7 ships inline annotations for split_line(), debug() and CompletionFinder.__call__, so the no-untyped-call ignores around those calls are now reported as unused-ignore and mypy exits non-zero.

(For the record, packaging was not involved — I confirmed the suite passes with packaging 26.3, and reverting argcomplete to 3.6.2 makes mypy clean again.)

Changes

• Removed the no-untyped-call code from three ignores in traitlets/config/argcomplete_config.py (the attr-defined code is still needed and stays).
• Removed the whole ignore on ExtendedCompletionFinder() in traitlets/config/loader.py.
• Floored the mypy pre-commit hook's argcomplete dependency at >=3.7 (was >=3.1), so the check means the same thing locally and in CI — on an older argcomplete the ignores would be required again.

The no-untyped-call ignores on super()._get_completions / _get_option_completions are untouched: those private methods are still unannotated.

Verification

mypy clean over 24 source files and 706 tests passing against argcomplete 3.7.2. Test Lint is green on this branch.

https://claude.ai/code/session_0141ZmpAbm5FVsds8iNEotpp

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.14%. Comparing base (1ba6d92) to head (7d21876).

Files with missing lines	Patch %	Lines
traitlets/config/argcomplete_config.py	50.00%	1 Missing ⚠️

Components	Coverage Δ
traitlets	85.50% <66.66%> (ø)
tests	99.06% <ø> (ø)

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[Carreau]

Test Lint is green now, which was the point of this PR. The only red check left is codecov/patch, and I don't plan to chase it — here's why.

This diff only edits # type: ignore comments; no executable code changed. Codecov still counts the three touched lines as "patch", and one of them — the argcomplete.debug(...) call at traitlets/config/argcomplete_config.py:76, inside the fallback for a non-integer $_ARGCOMPLETE — has never been covered. That gives 2/3 = 66.66% against the 80% patch target. The traitlets component delta settled at (ø): no coverage was actually lost.

Making that check green would mean adding a test whose only purpose is to exercise a line this PR doesn't touch the behaviour of. Happy to do it if you'd rather have the check green than the diff minimal — just say so.

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