chore: add CLAUDE.md for AI-assisted development

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.
+
+## Overview
+
+Payload CMS plugin that streams video uploads to cloud providers (currently Cloudflare Stream). When a video is uploaded to a Payload collection, the plugin copies it to the streaming provider, tracks processing status via background jobs, and renders an embedded player preview in the admin UI.
+
+## Commands
+
+```bash
+pnpm dev              # Run dev server (Next.js + Payload) on localhost:3000
+pnpm build            # Full build: copyfiles → tsc types → swc transpile
+pnpm lint             # ESLint (uses @payloadcms/eslint-config)
+pnpm lint:fix         # ESLint with auto-fix
+pnpm test:int         # Integration tests via vitest (uses MongoMemoryReplSet)
+pnpm test:e2e         # E2E tests via Playwright (starts dev server automatically)
+pnpm test             # Runs both int + e2e
+```
+
+Run a single integration test:
+```bash
+pnpm vitest run dev/int.spec.ts -t "test name"
+```
+
+## Architecture
+
+### Plugin entry point (`src/index.ts`)
+
+`videoStream()` is a Payload config function that:
+1. Injects a `stream` group field into configured collections
+2. Adds `afterOperation` hooks (copy video on create, update status on findByID)
+3. Adds `beforeDelete` hook (delete video from provider)
+4. Registers a background job task per adapter for polling stream readiness
+
+Collections can use the default adapter or specify a per-collection adapter override.
+
+### Adapter pattern (`src/adapters/`)
+
+`StreamAdapter` is an abstract class defining the provider interface: `copyVideo`, `delete`, `getStatus`, `getHTMLVideoPlayer`, `getSignedToken`. `CloudflareStreamAdapter` is the only implementation. New providers implement this abstract class.
+
+The adapter's `providerName` is used to generate unique job task slugs: `payloadStreamUpdateStatusFor${providerName}`.
+
+### Lifecycle flow
+
+1. **Upload** → `afterOperation` hook fires on `create` → `streamingService.copyVideoToStreamingPlatform()` runs after 1s delay via `setTimeout` → queues a `updateStreamStatus` background job
+2. **Status polling** → background job fetches status from provider → if not `readyToStream`, re-queues itself (up to 3 retries)
+3. **View** → `afterOperation` hook fires on `findByID` → if not `readyToStream`, fetches latest status and updates the document
+4. **Delete** → `beforeDelete` hook removes the video from the streaming provider
+
+### Field & UI components (`src/fields/`)
+
+The `stream` group field is conditionally shown only for `video/*` mimeTypes, positioned in the sidebar. It contains a `ui` type preview field that uses Payload's RSC component pattern:
+
+- `server.component.tsx` → exported via `payload-video-stream/rsc` → calls `adapter.getHTMLVideoPlayer()` server-side
+- `client.component.tsx` → exported via `payload-video-stream/client` → renders the iframe or processing/error state
+
+### Export paths
+
+- `payload-video-stream` — main plugin function + types
+- `payload-video-stream/adapters` — adapter classes and types
+- `payload-video-stream/services` — streaming service
+- `payload-video-stream/client` — client components
+- `payload-video-stream/rsc` — server components
+
+### Dev environment (`dev/`)
+
+A full Payload + Next.js app used for development and testing. Uses PostgreSQL by default, falls back to MongoMemoryReplSet for `NODE_ENV=test`. Configured with S3 storage and Cloudflare Stream adapter. Env vars needed: `DATABASE_URI`, `CLOUDFLARE_STREAM_*`, `S3_*`, `PAYLOAD_SECRET`.
+
+## Key conventions
+
+- ESM throughout (`"type": "module"` in package.json, `NodeNext` module resolution)
+- All internal imports use `.js` extensions (even for `.ts` files) per NodeNext convention
+- Build output goes to `dist/` via SWC with separate type declaration pass
+- Vitest integration tests spin up a real Payload instance with in-memory MongoDB
+- Plugin follows Payload's config function pattern: `(pluginOptions) => (config) => config`