fix: stop spinner before re-raising Ctrl+C and guard GitHub-only feat…

[Huerte]

Type

• Bug fix
• New feature
• Documentation
• Refactor / internal

Changes

• executor.py: wrap subprocess.run in its own try/except KeyboardInterrupt so the yaspin spinner is stopped before the interrupt is re-raised. This was causing a ghost spinner to re-appear after Ctrl+C in any command.
• pull.py, jump.py, undo.py: removed loading_msg and ok_text from run_command calls inside interrupt cleanup functions. Cleanup paths don't need a spinner.
• link.py: replaced hardcoded ensure_github_known_host() with get_remote_host(url) → ensure_known_host(host). SSH check now targets the actual remote host, not always github.com. Works for GitLab, Gitea, self-hosted, etc.
• init.py: _parse_template_slug now checks if the URL points to a non-GitHub host and raises a clear error instead of letting the GitHub API call fail mid-download.
• repo.py: added an upfront info() line at the start of repo_operation so users know this command is GitHub-specific before anything runs.

Checklist

• Tested locally and changes work as expected
• CHANGELOG.md updated under [Unreleased]
• README.md updated (if a command was added or changed)
• Tests added or updated (if applicable)
• No existing commands are broken (if they are, describe the impact above)

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 68.75000% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/pygitgo/utils/executor.py	50.00%	3 Missing ⚠️
src/pygitgo/commands/init.py	66.66%	1 Missing ⚠️
src/pygitgo/commands/undo.py	0.00%	1 Missing ⚠️

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