docs: drop references to code removed in #608

get_installed_plugin_info, WiFiManager's saved_networks and the six
always-skipping plugin test files are deleted there. NetworkManager already
remembers joined networks; LEDMatrix no longer stores WiFi passwords.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/HOW_TO_RUN_TESTS.md

@@ -225,15 +225,10 @@ test/
 ├── test_error_aggregator.py             # Error aggregation tests
 ├── test_schema_manager.py               # Schema manager tests
 ├── test_web_api.py                      # Web API tests
-├── plugins/                             # Per-plugin test suites
-│   ├── test_clock_simple.py
-│   ├── test_calendar.py
-│   ├── test_basketball_scoreboard.py
-│   ├── test_soccer_scoreboard.py
-│   ├── test_odds_ticker.py
-│   ├── test_text_display.py
-│   ├── test_visual_rendering.py
-│   └── test_plugin_base.py
+├── plugins/                             # Plugin rendering suites
+│   ├── test_plugin_matrix.py            # Every discovered plugin, across panel sizes
+│   ├── test_harness.py
+│   └── test_visual_rendering.py
 └── web_interface/
     ├── test_config_manager_atomic.py
     ├── test_state_reconciliation.py

docs/PLUGIN_STORE_GUIDE.md

@@ -186,11 +186,8 @@ curl "http://your-pi-ip:5000/api/v3/plugins/installed"
 from src.plugin_system.store_manager import PluginStoreManager
 
 store = PluginStoreManager(plugins_dir="plugin-repos")
-installed = store.list_installed_plugins()
-
-for plugin_id in installed:
-    info = store.get_installed_plugin_info(plugin_id)
-    print(f"{info['name']} (Last updated: {info.get('last_updated', 'unknown')})")
+for plugin_id in store.list_installed_plugins():
+    print(plugin_id)
 ```
 
 ### Enable/Disable Plugins
@@ -456,8 +453,7 @@ python3 -c "
 from src.plugin_system.store_manager import PluginStoreManager
 store = PluginStoreManager(plugins_dir='plugin-repos')
 for plugin_id in store.list_installed_plugins():
-    info = store.get_installed_plugin_info(plugin_id)
-    print(f'{plugin_id}: {info[\"name\"]} (Last updated: {info.get(\"last_updated\", \"unknown\")})')
+    print(plugin_id)
 "
 
 # Uninstall

docs/WIFI_NETWORK_SETUP.md

@@ -78,14 +78,7 @@ WiFi settings are stored in `config/wifi_config.json`:
 {
   "ap_ssid": "LEDMatrix-Setup",
   "ap_channel": 7,
-  "auto_enable_ap_mode": true,
-  "saved_networks": [
-    {
-      "ssid": "YourNetwork",
-      "password": "your-password",
-      "saved_at": 1234567890.0
-    }
-  ]
+  "auto_enable_ap_mode": true
 }
 ```
 
@@ -96,7 +89,6 @@ WiFi settings are stored in `config/wifi_config.json`:
 | `ap_ssid` | `LEDMatrix-Setup` | Network name broadcast in AP mode |
 | `ap_channel` | `7` | WiFi channel (1, 6, or 11 are non-overlapping) |
 | `auto_enable_ap_mode` | `true` | Automatically enable AP mode when both WiFi and Ethernet are disconnected |
-| `saved_networks` | `[]` | Array of saved WiFi credentials |
 
 ### Auto-Enable AP Mode Behavior
 
@@ -251,21 +243,11 @@ sudo chmod 600 config/wifi_config.json
 
 ### Network Configuration Tips
 
-**Save Multiple Networks:**
-```json
-{
-  "saved_networks": [
-    {
-      "ssid": "Home-Network",
-      "password": "home-password"
-    },
-    {
-      "ssid": "Office-Network",
-      "password": "office-password"
-    }
-  ]
-}
-```
+**Multiple Networks:**
+
+NetworkManager remembers every network you connect to and rejoins whichever is
+in range; list them with `nmcli connection show`. LEDMatrix itself does not
+store WiFi passwords.
 
 **Adjust Check Interval:**