fix: add ethtool, lsmod, lspci, modinfo, dkms to read-only command allowlist

Read-only diagnostic commands ethtool, lsmod, lspci, modinfo, and dkms
were missing from the readOnlyLeadPattern in the command classifier,
causing compound diagnostic commands (e.g. 'uname -r && ethtool -i eno1
&& lsmod | grep r8169') to be misclassified as config_mutation instead
of read_only. This forced operator approval for simple hardware/driver
inspection during the 2026-08-12 hubris NIC cutover session.

Added regression test with the exact compound command from that session.

internal/policy/command.go

@@ -72,6 +72,7 @@ var readOnlyLeadPattern = regexp.MustCompile(
 		`grep|egrep|fgrep|rg|wc|sort|uniq|cut|tr|tee|find|tree|locate|` +
 		`dpkg\s+(-l|-s|--list|--status)\b|apt\s+(list|search|show)\b|` +
 		`systemctl\s+(status|is-active|is-enabled|is-failed|list-units|list-unit-files|list-timers|show)\b|` +
+		`ethtool|lsmod|lspci|modinfo|dkms|` +
 		`timedatectl|hostnamectl|systemd-analyze|` +
 		`docker\s+(ps|images|inspect|logs|version|info|stats)|` +
 		`docker\s+compose\s+(logs|ps|top|config|images|port|cp)\b|` +

internal/policy/command_test.go

@@ -46,6 +46,12 @@ func TestClassifyCommand_ReadOnly(t *testing.T) {
 		"sudo pct exec 121 -- systemctl status caddy",
 		// qm guest exec on a VM, read-only inner.
 		"qm guest exec 100 -- systemctl status caddy",
+		// Hardware/driver diagnostic commands (F2 fix — 2026-08-12).
+		"ethtool -i eno1",
+		"lsmod",
+		"lspci",
+		"modinfo r8125",
+		"dkms status",
 	}
 	for _, c := range cases {
 		if got := ClassifyCommand(c, ""); got != RiskReadOnly {
@@ -171,6 +177,9 @@ func TestClassifyCommand_CompoundReadOnly(t *testing.T) {
 		// P4: the exact compound from session d0d562e0 — find + ls + tail +
 		// echo + journalctl, all read-only segments.
 		"ls -lt /var/log/rclone-backup/ | head -20 && tail -3 /var/log/rclone-backup/runs.jsonl || echo \"not found\" && find /var/log/rclone-backup/ -name 'runs.jsonl'",
+		// F2 fix: the exact compound diagnostic that was misclassified as
+		// config_mutation (2026-08-12 hubris NIC driver cutover session).
+		"uname -r && echo '---' && ethtool -i eno1 && echo '---' && lsmod | grep r8169 && echo '---' && ip link show eno1 && echo '---' && cat /etc/network/interfaces | head -30",
 	}
 	for _, c := range cases {
 		if got := ClassifyCommand(c, ""); got != RiskReadOnly {