Replace SftpClient stub write_file/list_inbound/read_file
implementations with real paramiko SSHClient + SFTPClient
calls. The public API (SftpClient.write_file, list_inbound,
read_file, get_secret) is unchanged from SP9 — same signature,
same return types — so the API layer needs no changes.
Real-mode behavior:
* _connect() returns a context manager yielding (ssh, sftp);
closes both on exit. Lazy-imports paramiko so the stub-only
test path doesn't need the dependency.
* Auth resolves from SftpBlock.auth: password_keychain_account
(MFT model) or key_file + optional key_passphrase_keychain_account.
Missing Keychain entries fail loud (RuntimeError) rather than
silently attempting empty-password auth.
* write_file: opens sftp.open(remote, 'wb') and writes bytes;
mkdirs the parent dir (idempotent — MFT pre-creates FromHPE/ToHPE).
* list_inbound: listdir_attr + per-file download into local
staging cache; skips directory entries (0o040000 mask).
* read_file: download via shutil.copyfileobj into BytesIO.
Stub mode is unchanged. AutoAddPolicy for first-time MFT host
fingerprint; operator should pin the key for production.
Adds tests/test_sftp_paramiko.py: 9 tests covering
* stub still works
* real-mode connect builds correct paramiko call from
password_keychain_account, raises on missing Keychain,
raises on missing auth config, raises on STUB_SECRET
* write_file opens 'wb' on the right path and writes bytes
* list_inbound translates attrs into InboundFile records and
caches files locally; skips dirs
Removes 2 obsolete tests in test_sftp_stub.py that expected
SP13-mode to raise NotImplementedError.
pyproject.toml: new optional 'sftp' extra (paramiko>=3.4,<6).
- New cyclone.db_crypto module:
* is_sqlcipher_available() — capability check
* is_encryption_enabled() — Keychain key + sqlcipher3 present
* get_db_key() — reads 'cyclone.db.key' from Keychain
* make_sqlcipher_connect_creator(url, key) — SQLAlchemy creator
- db._make_engine() now switches to SQLCipher when key is present
- pyproject.toml: optional 'sqlcipher' extra (sqlcipher3>=0.6,<1)
- Fallback: without Keychain key, DB stays plain SQLite (no surprise
behavior for operators who haven't set up encryption yet)
- Verified: encrypted file is unreadable as plain SQLite, wrong key
raises on first query, migrations + ORM work transparently
- HIPAA §164.312(a)(2)(iv) compliance note in docs
Tests: 705 -> 717 (12 new for SQLCipher). All 717 backend tests pass.
Tyler