docs: add CLAUDE.md for Claude Code guidance

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Build & Lint
+
+```bash
+# Validate podspec
+pod spec lint GADManager.podspec
+
+# Build via SPM
+swift build
+
+# CocoaPods install (in consumer projects)
+pod install
+```
+
+## Release Process
+
+1. Bump version in `GADManager.podspec` (`s.version`)
+2. Commit: `bump: release a.b.c`
+3. Tag: `git tag a.b.c && git push origin a.b.c`
+4. Push podspec: `pod trunk push GADManager.podspec`
+
+## Architecture
+
+GADManager is a generic Swift library (`GADManager<E>`) that wraps Google Mobile Ads SDK with time-based throttling and lifecycle management.
+
+**Core design:**
+- `E` is a user-defined `RawRepresentable` enum where `RawValue == String` — each case maps to an ad unit name
+- Ad unit IDs are read from `Info.plist` key `GADUnitIdentifiers` (a `[String: String]` dictionary keyed by enum raw values)
+- The manager tracks per-unit state via dictionaries: `adObjects`, `intervals`, `isLoading`, `isTesting`, `completions`, etc.
+
+**Ad lifecycle:**
+1. `prepare(...)` — loads the ad and caches it in `adObjects[unit]`
+2. `show(unit:force:needToWait:...)` — checks `canShow()` (time interval) and `isPrepared()` (ad validity/expiry), then calls `__show()`
+3. After dismissal (`adDidDismissFullScreenContent`), `reprepare()` is called automatically to reload
+
+**Supported ad types:** Interstitial, AppOpen (opening), Banner, Rewarded, Native
+
+**Key timing constants:**
+- `defaultInterval`: 1 hour between interstitial/reward shows
+- `opeingExpireInterval`: 4 hours (5 min in DEBUG) — AppOpen ad validity window after loading
+- `loadingExpirationInterval`: 1 minute
+
+**Delegate (`GADManagerDelegate`):**
+- Host app must persist and provide last-shown / last-prepared timestamps per unit
+- Optional callbacks: `willPresentAD`, `didDismissAD`
+
+**Extensions in `GADManager/extensions/`:**
+- `GADRequest+`: `hideTestLabel()`, `enableCollapsible(direction:)`
+- `UIViewController+`, `UIApplication+`, `UIAlertAction+`, `String+`: utilities for presenting alerts and opening settings/App Store
+
+## Distribution
+
+- **CocoaPods**: `pod 'GADManager'` — depends on `Google-Mobile-Ads-SDK` (static framework)
+- **SPM**: `Package.swift` — depends on `swift-package-manager-google-mobile-ads` ≥ 12.6.0
+
+## CI
+
+- **Gemini code review** (`gemini-dispatch.yml`): triggers on PR open or `@gemini` comment from OWNER/MEMBER/COLLABORATOR
+- **Claude** (`claude.yml`): separate workflow for Claude-based automation