docs: adds claude.md files

CLAUDE.md

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+# Privy Unity SDK
+
+Unity SDK for Privy authentication and embedded wallet functionality. Distributed as a UPM package (`com.privy.unity-sdk`), targeting Unity 2022.3+.
+
+## Repository Structure
+
+```
+SDK/            # UPM package — runtime code, editor tools, native plugins
+SampleApp/      # Unity project demonstrating SDK usage
+docs/           # Developer documentation (releasing.md, native-code.md)
+agent_docs/     # AI assistant reference docs (code conventions, PR review rules)
+Format.csproj   # Used for dotnet format (covers SDK/, excludes ExternalDependencies/)
+version.txt     # Canonical version (managed by release-please — do not edit manually)
+```
+
+For detailed SDK architecture, conventions, and patterns, see **[SDK/CLAUDE.md](SDK/CLAUDE.md)**.
+
+## Essential Commands
+
+```bash
+# Format all SDK source (run before committing)
+dotnet format Format.csproj
+```
+
+## Commit Conventions
+
+Use [Conventional Commits](https://www.conventionalcommits.org/) — `feat:`, `fix:`, `chore:`, `docs:`, etc. Release-please uses these to generate the changelog and determine the next version bump automatically.
+
+## Release Process
+
+1. Merge conventional-commit PRs into `main`
+2. Release-please opens a release PR bumping `version.txt`, `SDK/package.json`, and `SDK/Runtime/Utils/SdkVersion.cs`
+3. Review and merge the release PR — release-please then creates the GitHub Release and git tag
+
+See `docs/releasing.md` for the full release guide.
+
+## GitHub Actions
+
+| Workflow             | Trigger      | What it does                        |
+| -------------------- | ------------ | ----------------------------------- |
+| `claude.yml`         | PR           | Automated code review               |
+| `format-check.yml`   | PR           | Verifies `dotnet format` was run    |
+| `pr-title.yml`       | PR           | Enforces conventional commit format |
+| `release-please.yml` | Push to main | Manages release PRs and tags        |

SDK/CLAUDE.md

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+# Privy Unity SDK — SDK/
+
+Unity Package Manager package (`com.privy.unity-sdk`) providing authentication and embedded wallet functionality. Requires Unity 2022.3+.
+
+## Directory Structure
+
+```
+SDK/
+├── package.json            # UPM package manifest (version, dependencies)
+├── Runtime/                # All runtime C# source (included in player builds)
+├── Editor/                 # Editor-only scripts (excluded from player builds)
+├── ExternalDependencies/   # Vendored third-party libraries (UnityWebView, jsoncanonicalizer)
+└── Plugins/                # Native platform code (iOS Objective-C, WebGL .jslib)
+```
+
+## Architecture
+
+Every public service has a `public` interface (e.g. `ILoginWithEmail`) and a separate `internal` implementation (e.g. `LoginWithEmail`). SDK consumers only ever see interfaces and public models — never implementation classes.
+
+All dependencies are constructor-injected. See `docs/dependency-injection.md`.
+
+## Code Formatting
+
+```bash
+dotnet format Format.csproj
+```
+
+Run before committing. `Format.csproj` covers `Runtime/` and `Editor/` but excludes `ExternalDependencies/`.
+
+## XML Documentation
+
+All `public` interfaces, methods, properties, and classes require `/// <summary>` docs with `/// <param>` and `/// <exception cref="">` where applicable.
+
+## Versioning and Release
+
+See `docs/releasing.md`. Do not manually edit `version.txt`, `SDK/package.json`, or `SDK/Runtime/Utils/SdkVersion.cs`, and do not remove the `// x-release-please-start-version` / `// x-release-please-end` markers in `SdkVersion.cs`.
+
+## Native Plugins
+
+See `docs/native-code.md` for the ARC bridging guide, `MonoPInvokeCallback` pattern, and `DllImport`/`extern` usage.

SampleApp/CLAUDE.md

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+# SampleApp/
+
+A Unity project that demonstrates SDK usage. It is not a published artifact — its purpose is to exercise the public API and serve as a reference for consumers.

docs/dependency-injection.md

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+# Dependency Injection
+
+The SDK uses manual constructor injection. There is no DI framework.
+
+## Wiring
+
+All service instantiation happens in `PrivyImpl`'s constructor. When adding a new service, instantiate it there and pass its dependencies explicitly. No service locators or static helpers beyond `PrivyManager`.
+
+## Constructor params
+
+Required dependencies must be null-checked:
+
+```csharp
+_authDelegator = authDelegator ?? throw new ArgumentNullException(nameof(authDelegator));
+```
+
+## Entry point
+
+`PrivyManager.Initialize(config)` is the only way to create an SDK instance — no other public constructors exist. It creates `PrivyImpl`, which owns the full dependency graph.