docs: Update READMEs and library versions

This commit updates the README files for the `core:api`, `core:model`, and `core:proto` modules to improve documentation and reflect current usage.

Key changes include:
- Bumping the library version to `v2.7.13` in usage examples.
- Adding a detailed README for the `core:proto` module.
- Updating the `core:api` README to use `MeshtasticIntent` constants instead of hardcoded strings.

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

core/api/README.md

@@ -27,7 +27,7 @@ dependencies {
     // Replace 'v2.7.13' with the specific version you need
     val meshtasticVersion = "v2.7.13" 
 
-    // The core AIDL interface
+    // The core AIDL interface and Intent constants
     implementation("com.github.meshtastic.Meshtastic-Android:meshtastic-android-api:$meshtasticVersion")
     
     // Data models (DataPacket, MeshUser, NodeInfo, etc.)
@@ -77,15 +77,17 @@ override fun onServiceConnected(name: ComponentName?, service: IBinder?) {
 
 ### 3. Register a BroadcastReceiver
 
-To receive packets and status updates, register a `BroadcastReceiver`. 
+To receive packets and status updates, register a `BroadcastReceiver`. Use `MeshtasticIntent` constants for the actions.
 
 **Important:** On Android 13+ (API 33), you **must** use `RECEIVER_EXPORTED` since you are receiving broadcasts from a different application.
 
 ```kotlin
+// Using constants from org.meshtastic.core.api.MeshtasticIntent
 val intentFilter = IntentFilter().apply {
-    addAction("com.geeksville.mesh.RECEIVED.TEXT_MESSAGE_APP")
-    addAction("com.geeksville.mesh.NODE_CHANGE")
-    addAction("com.geeksville.mesh.CONNECTION_CHANGED")
+    addAction(MeshtasticIntent.ACTION_RECEIVED_TEXT_MESSAGE_APP)
+    addAction(MeshtasticIntent.ACTION_NODE_CHANGE)
+    addAction(MeshtasticIntent.ACTION_CONNECTION_CHANGED)
+    addAction(MeshtasticIntent.ACTION_MESH_DISCONNECTED)
 }
 
 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
@@ -97,6 +99,6 @@ if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
 
 ## Modules
 
-*   **`core:api`**: Contains `IMeshService.aidl`.
+*   **`core:api`**: Contains `IMeshService.aidl` and `MeshtasticIntent`.
 *   **`core:model`**: Contains Parcelable data classes like `DataPacket`, `MeshUser`, `NodeInfo`.
 *   **`core:proto`**: Contains the generated Protobuf code (Wire).

core/model/README.md

@@ -36,5 +36,5 @@ This module contains the Parcelable data classes used by the Meshtastic Android
 This module is typically used as a dependency of `core:api` but can be used independently if you need to work with Meshtastic data structures.
 
 ```kotlin
-implementation("com.github.meshtastic.Meshtastic-Android:meshtastic-android-model:v2.7.12")
-```
+implementation("com.github.meshtastic.Meshtastic-Android:meshtastic-android-model:v2.7.13")
+```

core/proto/README.md

@@ -19,3 +19,21 @@ classDef unknown fill:#FFADAD,stroke:#000,stroke-width:2px,color:#000;
 
 ```
 <!--endregion-->
+
+## Meshtastic Protobuf Definitions
+
+This module contains the generated Kotlin and Java code from the Meshtastic Protobuf definitions. It uses the [Wire](https://github.com/square/wire) library for efficient and clean model generation.
+
+### Key Components
+
+*   **Port Numbers**: Defines the `PortNum` enum for identifying different types of data payloads.
+*   **Mesh Protocol**: Contains the core `MeshPacket` and protocol message definitions.
+*   **Modules**: Includes definitions for telemetry, position, administration, and more.
+
+### Usage
+
+This module is typically used as a dependency of `core:api` and `core:model`.
+
+```kotlin
+implementation("com.github.meshtastic.Meshtastic-Android:meshtastic-android-proto:v2.7.13")
+```