Integrate upstream-compatible read-only MeshCentral transport

implementation/README.md

@@ -23,6 +23,7 @@ implementation/
 │   ├── contracts.ts          # Typed schemas and interfaces
 │   ├── adapter.ts            # Adapter factory and base interface
 │   ├── mock-adapter.ts       # Mock implementation for development
+│   ├── upstream-transport.ts # Proven read-only MeshCentral transport
 │   └── __tests__/            # Test suite
 ├── package.json              # Node.js dependencies
 ├── tsconfig.json             # TypeScript configuration
@@ -115,7 +116,7 @@ main().catch(console.error);
 | `timeoutMs` | number | `10_000` | Request timeout in milliseconds |
 | `maxOutputLength` | number | `65_536` | Maximum output bytes for diagnostics (truncates if exceeded) |
 
-> **Note:** The real adapter uses MeshCentral's `/control.ashx` WebSocket protocol for read-only inventory/status calls. Diagnostics still return mock data; no remote commands or state-changing operations are implemented.
+> **Note:** The real adapter uses the upstream-compatible MeshCentral `/control.ashx` WebSocket transport for read-only inventory/status calls. MeshCentral bootstrap messages and native grouped response formats are handled explicitly. Diagnostics still return mock data; no remote commands or state-changing operations are implemented.
 
 ## Supported Diagnostic Checks
 
@@ -156,7 +157,7 @@ All errors include a code from the `ErrorCodes` enum:
 
 > The real adapter is implemented locally and may be used only for the documented read-only compatibility test. It must remain limited to the approved MeshCentral account and PVE3 target.
 
-- **MeshCentral control-channel integration** - Implemented locally via `/control.ashx`
+- **MeshCentral control-channel integration** - Verified live via `/control.ashx`
 - **Device/group inventory and status** - Implemented locally
 - **Response size and schema validation** - Implemented and unit-tested
 - **Real-time status updates** - Not implemented