Update clients, docs, and install for CarConnectivity migration

- gui_client: update _TRACE_LABELS paths to new flat snapshot structure
- README: update library name, pip command, domain list, credentials
  template, output example, and module reference
- install.sh: update credentials template and systemd service description
- client.py: update docstring
- data_model: Kelvin→Celsius conversion for battery temps (CarConnectivity
  returns Kelvin); round range_estimated_full to 1 decimal
- jay_diff: fix merge when old value is not a dict; skip empty-dict
  branches in delete

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -1,6 +1,6 @@
 # we_monitor
 
-Periodically polls a VW WeConnect vehicle via the `weconnect` library, stores
+Periodically polls a VW vehicle via the `carconnectivity` library, stores
 timestamped records as JSON, and pushes live data to connected TCP clients.
 A PyQt5 GUI client visualises the data in real time.
 
@@ -14,7 +14,7 @@ server/
   data_model.py         — domain extractors, collect_snapshot()
   network.py            — TCP push server (accept loop + broadcast)
   storage_helpers.py    — load / save JSON store, midnight rotation helpers
-  we_connect.py         — WeConnect login and vehicle selection
+  we_connect.py         — CarConnectivity login and vehicle selection
   log_config.py         — logging setup
 utils/
   jay_diff.py           — JSON diff / merge library
@@ -25,7 +25,7 @@ requirements.txt
 ## Requirements
 
 ```
-pip install weconnect PyQt5 pyqtgraph
+pip install carconnectivity carconnectivity-connector-volkswagen PyQt5 pyqtgraph
 ```
 
 Or use the installer which also sets up a systemd user service:
@@ -38,7 +38,7 @@ Or use the installer which also sets up a systemd user service:
 
 ## Collector (`collect.py`)
 
-Connects to WeConnect, polls selected domains at a configurable interval, and
+Connects via CarConnectivity, polls selected domains at a configurable interval, and
 appends timestamped records to a rotating JSON log.  Simultaneously runs a TCP
 push server so clients receive every new snapshot the moment it is collected.
 
@@ -68,7 +68,7 @@ All connection and collection settings live in a single JSON file:
     "password": "secret"
   },
   "vin":        "WVWZZZE1ZMP000000",
-  "domains":    ["charging", "measurements", "readiness"],
+  "domains":    ["charging", "electric_drive", "connectivity"],
   "interval_s": 300,
   "host":       "0.0.0.0",
   "port":       9999,
@@ -79,10 +79,10 @@ All connection and collection settings live in a single JSON file:
 
 | Key | Default | Description |
 |-----|---------|-------------|
-| `credentials.username` | — | WeConnect / MyVolkswagen email |
-| `credentials.password` | — | WeConnect password |
+| `credentials.username` | — | MyVolkswagen email |
+| `credentials.password` | — | MyVolkswagen password |
 | `vin` | first vehicle | Target VIN |
-| `domains` | `["charging","measurements","readiness"]` | Domains to collect (list or `"all"`) |
+| `domains` | `["charging","electric_drive","connectivity"]` | Domains to collect (list or `"all"`) |
 | `interval_s` | `300` | Collection interval in seconds |
 | `host` | `"0.0.0.0"` | Push server bind address |
 | `port` | `9999` | Push server TCP port |
@@ -104,12 +104,12 @@ CLI flags override the corresponding credentials-file value when given.
 | `--log-dir DIR` | `log_dir` | Directory for rotating log files |
 | `--max-records N` | — | Keep only the last N records per file (default: unlimited) |
 | `--diff` | `diff` | Enable diff-mode on the push server |
-| `--dry` | — | Skip WeConnect login; run push server only (useful for GUI testing) |
+| `--dry` | — | Skip CarConnectivity login; run push server only (useful for GUI testing) |
 | `-v` | — | Verbose / debug logging |
 | `--list-domains` | — | Print available domains and exit |
 
-**Available domains:** `charging`, `climatisation`, `measurements`,
-`readiness`, `parking`, `access`
+**Available domains:** `charging`, `climatisation`, `electric_drive`,
+`connectivity`, `vehicle`, `position`, `doors`
 
 ### Log rotation
 
@@ -129,10 +129,12 @@ Log files are named `YYYY_MM_DD_HH_MM_SS_<VIN>.json` and contain:
     {
       "ts": "2025-05-25T10:00:00+00:00",
       "charging": {
-        "batteryStatus": {
-          "currentSOC":            { "value": 80,  "unit": "%" },
-          "cruisingRangeElectric": { "value": 310, "unit": "km" }
-        }
+        "state": "readyForCharging",
+        "power": { "value": 11.0, "unit": "kW" }
+      },
+      "electric_drive": {
+        "range":   { "value": 310, "unit": "km" },
+        "battery": { "soc": { "value": 80, "unit": "%" } }
       }
     }
   ]
@@ -259,14 +261,14 @@ pretty-printed JSON with a running record counter.
 ### `collect.py`
 
 Entry point for the collector daemon.  Parses CLI / credentials-file arguments,
-establishes the WeConnect session, starts the push server, and runs the main
+establishes the CarConnectivity session, starts the push server, and runs the main
 poll loop.
 
 ### `server/data_model.py`
 
 `collect_snapshot(vehicle, domains) → dict`  
-Iterates over the requested domains on a `weconnect.Vehicle` and extracts every
-`Status` attribute into a flat-ish dict keyed by domain and status-object name.
+Iterates over the requested domains on a CarConnectivity vehicle object and extracts
+fields into a flat dict keyed by domain.
 Physical values are normalised to `{"value": …, "unit": …}`.  Returns a record
 with a top-level `"ts"` ISO-8601 timestamp.
 
@@ -307,8 +309,8 @@ the last 24 hours, and returns them sorted by timestamp.
 
 ### `server/we_connect.py`
 
-`connect(username, password) → WeConnect`  
-Authenticates and returns a connected `WeConnect` instance.
+`connect(username, password) → CarConnectivity`  
+Authenticates and returns a connected `CarConnectivity` instance.
 
 `select_vehicle(wc, vin) → (vehicle, error)`  
 Returns the target vehicle (first available if `vin` is empty) or an error string.