Flo 69707b4475 feat: keychain-aware credential helper, array refactor, cleanup ...

- Detect GCM (Git Credential Manager) as preferred cross-platform helper
- Recognize osxkeychain, GCM, libsecret, gnome-keyring as keychain-backed
- Print distro-specific install hints when no keychain helper found
- Refactor apply_setting_group and apply_ssh_directive_group to use bash
  arrays instead of sed-indexed newline-delimited strings
- Extract get_ssh_directive_value() to deduplicate SSH config parsing
- Fix stale function name in tests (apply_ssh_directive → apply_single_ssh_directive)
- Remove orphan comment in detect_existing_keys
- Bump version to 0.4.0

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-04 15:00:02 +02:00

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