Totalize the transport interface: one dispatch in the realization layer, not four arms in six callers

dag/gunbc/ci_deploy_target_host.dag

@@ -8,7 +8,7 @@ import std.disposition { Disposition, Scaffold, SingleAuthority }
 import std.decl_ref { DeclarationRef, WholeDeclaration }
 import extdeps.shell
 import gunbc.hostname_read {
-  hostname_short_read_local,
+  hostname_short_read,
   HostnameShortCaptured,
   HostnameShortCaptureRefused,
 }
@@ -35,7 +35,7 @@ type DeployTargetHostObservation {
 }
 
 fn deploy_target_host_observed_hostname() -> String {
-  match hostname_short_read_local() {
+  match hostname_short_read(transport: LocalShell) {
     HostnameShortCaptured { value: name } => name
     HostnameShortCaptureRefused { reason: _ } => ""
   }

dag/gunbc/fleet_converge_cli.dag

@@ -10,7 +10,7 @@ import gunbc.fleet_posix_accounts { fleet_posix_operator_user }
 import gunbc.hostname_read {
   HostnameShortCaptured,
   HostnameShortCaptureRefused,
-  hostname_short_read_local,
+  hostname_short_read,
 }
 import gunbc.fleet_converge_apply { converge_apply_for_host, fleet_compute_host_for_identity }
 import gunbc.host_layout { fleet_converge_receipt_dir, srv1_gunbc_repo_root }
@@ -135,7 +135,7 @@ fn converge_kernel_short_hostname_from_content(raw: String) -> String {
 }
 
 fn converge_local_kernel_short_hostname() -> String {
-  match hostname_short_read_local() {
+  match hostname_short_read(transport: LocalShell) {
     HostnameShortCaptured { value: v } => v
     HostnameShortCaptureRefused { reason: _ } => ""
   }

dag/gunbc/host_converge_slice1.dag

@@ -1,6 +1,7 @@
 module gunbc.host_converge_slice1
 
 import std.types { String, NonEmptyStr, Bool, Int, List }
+import gunbc.host_effect { LocalShell }
 import std.disposition { Disposition, Terminal }
 import product.placement_supply { HostIdentity }
 import extdeps.systemd {
@@ -16,7 +17,7 @@ import extdeps.systemd {
   TaskLimitAbsent,
 }
 import gunbc.systemctl_show_read {
-  systemctl_show_property_read_local,
+  systemctl_show_property_read,
   SystemdPropertyCaptured,
   SystemdPropertyCaptureRefused,
 }
@@ -177,7 +178,7 @@ fn host_converge_slice1_probed_at() -> NonEmptyStr? {
 }
 
 fn host_converge_slice1_read_memory_max_raw(unit: NonEmptyStr) -> String? {
-  match systemctl_show_property_read_local(unit: unit, property: MemoryMax) {
+  match systemctl_show_property_read(transport: LocalShell, unit: unit, property: MemoryMax) {
     SystemdPropertyCaptured { value: raw } => Present { value: raw }
     SystemdPropertyCaptureRefused { reason: _ } => none
   }
@@ -321,14 +322,14 @@ fn host_converge_slice1_tasks_knob(host: HostIdentity) -> ConvergeKnob? {
 }
 
 fn host_converge_slice1_read_tasks_max_raw(unit: NonEmptyStr) -> String? {
-  match systemctl_show_property_read_local(unit: unit, property: TasksMax) {
+  match systemctl_show_property_read(transport: LocalShell, unit: unit, property: TasksMax) {
     SystemdPropertyCaptured { value: raw } => Present { value: raw }
     SystemdPropertyCaptureRefused { reason: _ } => none
   }
 }
 
 fn host_converge_slice1_read_tasks_current_raw(unit: NonEmptyStr) -> String? {
-  match systemctl_show_property_read_local(unit: unit, property: TasksCurrent) {
+  match systemctl_show_property_read(transport: LocalShell, unit: unit, property: TasksCurrent) {
     SystemdPropertyCaptured { value: raw } => Present { value: raw }
     SystemdPropertyCaptureRefused { reason: _ } => none
   }

dag/gunbc/host_hygiene_reaper_observe.dag

@@ -1,13 +1,14 @@
 module gunbc.host_hygiene_reaper_observe
 
 import std.types { String, NonEmptyStr, Bool, List, FilePath }
+import gunbc.host_effect { LocalShell }
 import std.disposition { Disposition, Terminal }
 import std.realization_reconcile { ShowEffectiveRead, ReadObserved, ReadAbsent, Reconciliation }
 import extdeps.systemd { SystemdUnitActiveState, ActiveState, ControlGroup, parse_systemd_unit_active_state }
 import extdeps.shell
 import gunbc.host_converge { gunbc_runner_all_slots_unit_glob }
 import gunbc.systemctl_show_read {
-  systemctl_show_property_read_local,
+  systemctl_show_property_read,
   SystemdPropertyCaptured,
   SystemdPropertyCaptureRefused,
 }
@@ -33,14 +34,14 @@ data host_hygiene_cgroupfs_root: String = "/sys/fs/cgroup"
 data host_hygiene_build_cache_cmdline_marker: String = "sccache"
 
 fn host_hygiene_read_active_state(unit: NonEmptyStr) -> SystemdUnitActiveState? {
-  match systemctl_show_property_read_local(unit: unit, property: ActiveState) {
+  match systemctl_show_property_read(transport: LocalShell, unit: unit, property: ActiveState) {
     SystemdPropertyCaptured { value: raw } => parse_systemd_unit_active_state(raw: raw)
     SystemdPropertyCaptureRefused { reason: _ } => none
   }
 }
 
 fn host_hygiene_read_control_group(unit: NonEmptyStr) -> String? {
-  match systemctl_show_property_read_local(unit: unit, property: ControlGroup) {
+  match systemctl_show_property_read(transport: LocalShell, unit: unit, property: ControlGroup) {
     SystemdPropertyCaptured { value: cg } => if cg == "" { none } else { Present { value: cg } }
     SystemdPropertyCaptureRefused { reason: _ } => none
   }