Remove Python 3.7+ constructs so the tool runs on 3.6:
- Drop `from __future__ import annotations` (3.7+) and convert all
builtin-generic annotations (list[]/dict[]/tuple[]/set[]) to their
typing.List/Dict/Tuple/Set equivalents, since without the future
import these annotations are evaluated eagerly and builtin generic
subscription only exists on 3.9+.
- Replace subprocess.run(capture_output=, text=) — both 3.7+ — with
stdout/stderr=PIPE and universal_newlines=True; update the matching
test assertion.
- requirements.txt: gate cryptography>=41 behind python_version>=3.7 and
pin cryptography<41 (last 3.6-compatible line, 40.0.2) plus the
dataclasses backport for 3.6.
- Suppress cryptography 40.x's per-import "Python 3.6 is no longer
supported" deprecation warning so it doesn't pollute CLI/cron stderr;
the <41 pin keeps us on a supported release regardless.
The only cryptography API used is AESGCM (present since 2.0), so no
x509/API-surface changes are needed for the older pin.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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