Repoint ADR references after HQ consolidated 65 records to 23

96 comments across the two repos named records that no longer exist. Each now
points at the consolidated record that holds its reasoning -- ADR 0034 (a test
defends a decision) is 0017, the eight host records are 0005, the four lab
records are 0016.

Worth noting for next time: these are references from outside HQ, so renumbering
there is not free. It cost 38 files here.

internal/system/system_test.go

@@ -238,7 +238,7 @@ func TestOpenRCBootStateComesFromTheRunlevel(t *testing.T) {
 }
 
 func TestEachSystemUsesItsOwnCommands(t *testing.T) {
-	// The whole point of ADR 0060: the alpine host must never reach for systemctl, and the arch
+	// The whole point of ADR 0005: the alpine host must never reach for systemctl, and the arch
 	// host must never reach for rc-service.
 	for _, tc := range []struct{ name, forbidden string }{
 		{"arch", "rc-service"},