fix: quote git push tag suggestions

[w3lld1]

Summary

Fixes #114 by shell-quoting tag names in the git push suggestions printed after creating/deleting GTO tags.

Changes

• Use shlex.quote() when rendering the suggested tag argument.
• Preserve unquoted suggestions for shell-safe tag names such as a1@v0.0.1.
• Quote tags containing shell-significant characters like # and !, e.g. git push origin 'nn1#prod#1'.
• Update CLI regression expectations for register/assign suggestions.

Verification

• pytest tests/test_cli.py::test_register tests/test_cli.py::test_assign -q
• pytest -q
  • 188 passed, 1 warning
• python -m py_compile gto/*.py
• git diff --check

[Copilot]

Pull request overview

This PR addresses issue #114 by making the CLI’s “git push …” follow-up suggestions safe to copy/paste in shells when GTO-generated tag names contain shell-significant characters (e.g., #, !), by applying POSIX-style shell quoting.

Changes:

• Use shlex.quote() when rendering the tag argument in the “To push the changes upstream…” suggestion output.
• Update CLI regression tests to expect quoted suggestions for tags containing shell-significant characters.
• Preserve unquoted output for already shell-safe tag names (since shlex.quote() leaves safe strings unchanged).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
gto/registry.py	Quotes tag names in the printed git push suggestions via shlex.quote() to avoid shell parsing issues.
tests/test_cli.py	Updates expected CLI output strings to match the newly quoted git push suggestions.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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