Argcomplete

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- zsh: add global completion system install dir to user fpath if not
present

- Update shell_integration.py to support spaces in script file path.
(525)

- Fix completion when wordbreak is first character (526)

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- Support namespace package traversal when completing Python entry
points

- zsh: skip repeat Python runs in the same completion run

- Make \_parse_known_args signature more general for future API changes

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- Use interactive shells and bind to make environment variable name
completions work in older Bash versions (506)

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- Fix \_parse_known_args monkeypatching

- Note: This fix is required to restore compatibility with Python 3.12.8 and 3.13.1.

- CI improvements

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- Restore compatibility with argparse in Python 3.12.7+ (508)

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- Use project.scripts instead of setuptools scripts (498)

- Test infrastructure improvements