fix(adminui,cli): /raw device-name placeholder + no-prerender tree, CLI read prints Bad status (#577)

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

docs/drivers/AbCip.md

@@ -75,7 +75,8 @@ the driver's `DriverConfig` JSON. Key fields:
 
 - **`Devices`** — one `AbCipDeviceOptions` per PLC (`HostAddress`, `PlcFamily`, optional `DeviceName`, per-device `AllowPacking` / `ConnectionSize` overrides).
 - **`Tags`** — pre-declared `AbCipTagDefinition` list; `Members` for UDT fan-out, `SafetyTag` for GuardLogix safety-partition tags.
-- **`Probe`** — connectivity-probe `Enabled` / `Interval` / `Timeout` / `ProbeTagPath`.
+- **`Probe`** — connectivity-probe `Enabled` / `Interval` / `Timeout` / `ProbeTagPath`. A driver created from the AdminUI starts with the probe **off** (an enabled probe with no tag path only logs a warning); an absent `probe` key in a stored config still means enabled to the driver.
+- AdminUI driver forms (AbCip/AbLegacy) overlay only the keys they edit onto the stored JSON, so unmodelled keys survive a save (#576).
 - **`Transport`** — absent (default ⇒ `Native`), `Native`, or `Libplctag` (fallback); see [Transport](#transport-transport-option).
 - **Discovery** — `EnableControllerBrowse` (`@tags` walk) and `EnableDeclarationOnlyUdtGrouping` (whole-UDT read fast path).
 - **Alarms** — `EnableAlarmProjection` + `AlarmPollInterval` for the ALMD projection.