Add unit tests for cidata loading and the SSH access phase

./test/all runs every suite under test/: the shell tests exercise
omarchy-cidata-load against a sandbox with mount/umount/udevadm stubbed,
and test_configure_ssh_access.py runs the orchestrator phase against a
temp target with subprocess.run recorded and ufw's
write-the-rule-then-fail chroot behavior simulated. The Python tests go
through unittest discovery, which also picks up the repo's existing
test_*.py suites that previously had no runner.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/all

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -euo pipefail
+
+ROOT=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)
+
+for test in "$ROOT"/test/*-test.sh; do
+  printf '==> %s\n' "${test#$ROOT/}"
+  bash "$test"
+done
+
+printf '==> test/test_*.py\n'
+python3 -m unittest discover -t "$ROOT" -s "$ROOT/test"