chore(Agents): Add AGENTS.md

AGENTS.md

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+# Core - Infomaniak Android Library
+
+## Package Identity
+
+Modular Android library consumed via Gradle composite builds. Provides shared authentication, networking, UI components, and
+utilities across Infomaniak apps. Designed for JDK 17+, minSdk 27, compiled SDK 35.
+
+## Setup & Development
+
+> **Note**: When this library is included as a Gradle composite build inside another project under the `:Core` path, all
+> task paths below should be prefixed with `Core:` (e.g., `./gradlew Core:assemble`). When working in this repository
+> standalone, omit the prefix.
+
+```bash
+# Build all modules
+./gradlew assemble
+
+# Run all tests
+./gradlew test
+
+# Lint with ktlint
+./gradlew ktlintCheck
+
+# Build a specific module
+./gradlew :Auth:build
+./gradlew :Network:build
+```
+
+## Module Categories
+
+### Authentication & Security
+
+- **Auth**: OAuth2 flow, account management, token storage
+    - Key: `Auth/src/main/kotlin/com/infomaniak/core/auth/`
+    - Examples: token/interceptor/authenticator classes (e.g., `TokenInterceptor.kt`, `TokenAuthenticator.kt`, `CredentialManager.kt`)
+- **TwoFactorAuth**: 2FA verification UI (Front) and backend (Back)
+- **AppIntegrity**: App attestation and integrity checks
+
+### Networking
+
+- **Network**: Ktor HTTP client with interceptors
+    - Key: `Network/Ktor/src/main/`
+    - HTTP client factory: `Network/Ktor/src/main/kotlin/CreateHttpClient.kt`
+    - Models: `Network/Models/src/main/`
+- **Ktor**: Low-level Ktor extensions
+
+### UI Components
+
+- **Ui:Compose**: Modern Compose components
+    - Theme: `Ui/Compose/Theme/src/main/`
+    - Components: `Ui/Compose/BottomStickyButtonScaffolds/`, `Basics/`
+- **Ui:View**: Legacy XML components (SharedViews, EdgeToEdge)
+- **CrossAppLogin**: Cross-application authentication
+
+### Utilities & Features
+
+- **Common**: Shared extensions, formatters, utilities
+    - Formatters: `FormatterFileSize.kt`, date formatters
+- **Coil**: Image loading configuration
+- **Matomo**: Analytics tracking
+- **Sentry**: Error reporting
+- **Notifications**: Push notification handling
+- **Stores**: In-app review and update support
+
+### Legacy Support
+
+- **Legacy**: Backward compatibility module
+    - Use: `implementation(project(":Core:Legacy"))`
+    - Init in Application: `InfomaniakCore.init(...)`
+
+## Patterns & Conventions
+
+- **Module naming**: Descriptive, PascalCase (e.g., `AppVersionChecker`, `TwoFactorAuth`)
+- **Composite build**: Consume via Maven coordinates `com.infomaniak.core:<artifact>`, where nested Gradle project paths map `:` to `.` in the artifact name (e.g., `:TwoFactorAuth:Front` → `com.infomaniak.core:TwoFactorAuth.Front`)
+- **Ktlint**: Android mode enabled (version set in `build.gradle.kts`)
+- **No main**: Libraries have no Application class
+
+## Key Files
+
+- Build plugin: `build-logic/composite/src/main/kotlin/com/infomaniak/core/composite/CoreCompositePlugin.kt`
+- Dependency catalog: `gradle/core.versions.toml`
+- Shared values: `SharedValues/src/main/`
+
+## JIT Index
+
+### Find module implementations
+
+```bash
+# Auth utilities
+rg -n "AuthToken|AccountManager" Auth/
+
+# Network interceptors
+rg -n "Interceptor|RequestBuilder" Network/
+
+# Compose components
+rg -n "@Composable" Ui/Compose/
+
+# Common extensions
+rg -n "fun|suspend" Common/src/main/kotlin/com/infomaniak/core/common/
+```
+
+### Test file locations
+
+```bash
+# Unit tests per module
+rg -n "@Test" */src/test/
+
+# Example: Auth tests
+find Auth/src/test -name "*.kt"
+
+# Example: Common utils tests
+find Common/src/test -name "*.kt"
+```
+
+## Common Gotchas
+
+- **Composite build**: Changes in Core are immediately available in consuming projects
+- **Dependency mapping**: Modules use Maven coordinates but resolve locally
+- **Legacy init**: Must call `InfomaniakCore.init()` in consuming app's Application class
+- **Ktor client**: Use the canonical `createHttpClient(...)` factory under `Network/Ktor/src/main/kotlin/CreateHttpClient.kt` for consistent setup
+
+## Pre-PR Checks
+
+```bash
+# Standalone (in this repository)
+./gradlew test && ./gradlew ktlintCheck
+
+# As composite build (prefix with Core: when consumed from another project)
+./gradlew Core:test && ./gradlew Core:ktlintCheck
+```