- add circular-import justification comment on the deferred get_default_port import
- drop no-op continue in the per-type loop
- add NOTE clarifying last_exc reflects the final (RSAKey) attempt
- clarify docstring re paramiko 3.2+ PKey.from_path() and why it's unsafe here
- strengthen ed25519/RSA tests with isinstance assertions on the parsed key type
- add test for passphrase-protected key without password (PasswordRequiredException)
- add test for an unparseable key (SSHException listing all attempted types)
- de-duplicate test setup via _make_manager / _make_ssh_tunnel helpers
- consistent assertion messages across key-type tests
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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