Add comprehensive GitHub Copilot instructions for Android development workflow with complete network requirements

.github/copilot-instructions.md

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+# Gramophone Android Music Player
+
+Always reference these instructions first and fallback to search or bash commands only when you encounter unexpected information that does not match the info here.
+
+## Working Effectively
+
+### Essential Setup (Required Before Any Build Attempts)
+- Install JDK 21: `sudo apt update && sudo apt install -y openjdk-21-jdk`
+- Set environment variables:
+  ```bash
+  export JAVA_HOME=/usr/lib/jvm/java-21-openjdk-amd64
+  export PATH=$JAVA_HOME/bin:$PATH
+  ```
+- Initialize git submodules: `git submodule update --init --recursive` -- takes 2-3 minutes. NEVER CANCEL.
+- Create package.properties file: `echo "releaseType=SelfBuilt" > package.properties`
+
+### Build Commands (NETWORK DEPENDENT)
+- **CRITICAL**: All builds require internet access to download Android Gradle Plugin from Google repositories
+- **CRITICAL**: Gradle builds WILL FAIL without network access to `dl.google.com` and `repo.maven.apache.org`
+- Debug build: `./gradlew :app:assembleDebug` -- takes 10-15 minutes when working. NEVER CANCEL. Set timeout to 30+ minutes.
+- Release build: `./gradlew :app:assembleRelease` -- takes 15-20 minutes when working. NEVER CANCEL. Set timeout to 45+ minutes.
+- Run tests: `./gradlew test` -- takes 5-10 minutes when working. NEVER CANCEL. Set timeout to 20+ minutes.
+
+### Fastlane Setup and Usage
+- Install Ruby dependencies: `sudo bundle install` (must use sudo due to system gem permissions)
+- Fastlane version: `bundle exec fastlane --version`
+- Available lanes:
+  - `bundle exec fastlane android test` -- Runs Gradle tests
+  - `bundle exec fastlane android buildrel` -- Build release APK
+  - `bundle exec fastlane android googleplay` -- Deploy to Google Play Store
+  - `bundle exec fastlane android gitrel` -- Build and push release to GitHub
+  - `bundle exec fastlane android preprel` -- Prepare new release version
+
+### Network Limitations
+- **CRITICAL**: If network access to Google/Maven repositories is blocked, ALL Gradle builds will fail
+- **CRITICAL**: If network access to JitPack.io is blocked, builds will fail with media3 dependency errors
+- **CRITICAL**: You cannot build or test Android code without internet access
+- Error pattern: "Plugin [id: 'com.android.application', version: 'X.X.X'] was not found"
+- JitPack error pattern: "jitpack.io: No address associated with hostname"
+- **WORKAROUND**: Document that builds require network access in any instructions you provide
+
+## Validation Scenarios
+- **NETWORK REQUIRED**: Cannot fully validate builds without internet access
+- **BASIC VALIDATION**: Verify git submodules initialized, package.properties exists, JDK 21 installed
+- **SYNTAX VALIDATION**: Use `./gradlew tasks --dry-run` to check basic Gradle setup (will still fail on plugin resolution)
+- **LINT VALIDATION**: Cannot run Android lint without successful Gradle sync
+
+## Repository Structure
+```
+.
+├── app/                    # Main Android application module
+├── alacdecoder/           # ALAC audio decoder module  
+├── baselineprofile/       # Android baseline profile generation
+├── hificore/              # Native audio core with C++ code
+├── media3/                # Git submodule - Android Media3 library fork
+├── fastlane/              # Deployment automation
+├── .github/workflows/     # CI/CD pipelines
+├── gradle/                # Gradle wrapper files
+├── build.gradle.kts       # Root build configuration
+├── settings.gradle.kts    # Gradle project settings
+├── gradle.properties      # Gradle build properties
+├── package.properties     # Required: Package type configuration
+└── Gemfile               # Ruby/Fastlane dependencies
+```
+
+## Key Project Modules
+- **app**: Main Android application (Kotlin, Compose UI)
+- **hificore**: Native audio processing (C++/JNI)
+- **alacdecoder**: ALAC audio format decoder
+- **baselineprofile**: Performance optimization profiles
+- **media3**: Forked ExoPlayer library (git submodule)
+
+## Common Issues and Fixes
+- **"Plugin not found" errors**: Requires internet access to Google repositories
+- **"jitpack.io: No address associated with hostname"**: Requires internet access to JitPack repository
+- **"git submodule" errors**: Run `git submodule update --init --recursive`
+- **"package.properties" errors**: Create file with `echo "releaseType=SelfBuilt" > package.properties`
+- **JDK version errors**: Ensure JDK 21 is installed and JAVA_HOME is set
+- **Fastlane permission errors**: Use `sudo bundle install` for gem installation
+- **Build cache issues**: Clear with `./gradlew clean --build-cache`
+
+## GitHub Actions CI
+- Workflow file: `.github/workflows/android.yml`
+- Triggers: Push to beta branch, pull requests
+- Requirements:
+  - JDK 21 (temurin distribution)
+  - Git submodules checkout
+  - Package type: `releaseType=CI`
+  - Signing keys for release builds (secrets)
+- Build targets: `:app:assembleRelease` (main), `:app:assembleDebug` (PR)
+
+## Development Workflow
+- **Target branch**: `beta` (main development branch)
+- **Build variant**: `debug` for development, `release` for distribution
+- **Package types**: `SelfBuilt`, `CI`, `Release` (set in package.properties)
+- **Native dependencies**: Requires NDK for hificore C++ module
+- **Code style**: Kotlin with Compose UI, follows Android architecture guidelines
+
+## Architecture Notes
+- **UI**: Jetpack Compose with Material 3 design
+- **Audio**: Custom native audio engine (hificore) + Media3
+- **Database**: MediaStore integration for music discovery
+- **Performance**: Baseline profiles for optimization
+- **Testing**: JUnit + Android instrumentation tests
+- **Release**: Fastlane automation for Play Store deployment
+
+## Build Dependencies
+- **Minimum**: JDK 21, Android SDK, internet access
+- **Recommended**: Android Studio Electric Eel or later
+- **Native**: Android NDK for C++ compilation
+- **Ruby**: 3.2+ for Fastlane (bundle install required)
+- **Git**: Submodule support essential
+
+## Time Expectations
+- **NEVER CANCEL**: All build operations require completion
+- **Submodule init**: 2-3 minutes
+- **Debug build**: 10-15 minutes (first time), 3-5 minutes (incremental)
+- **Release build**: 15-20 minutes (first time), 5-10 minutes (incremental) 
+- **Tests**: 5-10 minutes
+- **Fastlane operations**: 10-30 minutes depending on lane
+- **Baseline profile generation**: 20-30 minutes
+
+## Critical Timeouts
+- Set Gradle build timeouts to **45+ minutes** minimum
+- Set test timeouts to **20+ minutes** minimum
+- Set fastlane timeouts to **60+ minutes** minimum
+- **NEVER use default timeouts** - they will cause premature cancellation
+
+## Environment Setup Commands
+```bash
+# Essential setup sequence
+export JAVA_HOME=/usr/lib/jvm/java-21-openjdk-amd64
+export PATH=$JAVA_HOME/bin:$PATH
+git submodule update --init --recursive
+echo "releaseType=SelfBuilt" > package.properties
+sudo bundle install
+
+# Verify setup
+java -version  # Should show JDK 21
+./gradlew --version  # Should work with JDK 21
+bundle exec fastlane --version  # Should show fastlane version
+```
+
+## Network Requirements
+- **CRITICAL**: Google Maven repositories access required
+- **CRITICAL**: Maven Central repository access required  
+- **CRITICAL**: JitPack.io repository access required for media3 dependencies
+- **CRITICAL**: RubyGems.org access required for Fastlane
+- **URLs needed**: `dl.google.com`, `repo.maven.apache.org`, `jitpack.io`, `rubygems.org`
+- **Failure mode**: All builds fail with plugin resolution errors if network blocked
+- **JitPack specific error**: "jitpack.io: No address associated with hostname" when accessing media3 dependencies