docs: share agent guidance between Claude Code and Codex via AGENTS.md

AGENTS.md

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 # AGENTS.md
 
+Guidance for coding agents working in this repository. `CLAUDE.md` imports this file.
+
+## Build & Test Commands
+
+```sh
+bun install                # Install dependencies
+bun run build              # Build (tsup, outputs to packages/agent-react-devtools/dist/)
+bun run test               # Run all unit tests (vitest)
+bun run typecheck          # Type check (tsc --noEmit)
+bun run lint               # Same as typecheck — no formatter/linter configured
+```
+
+Run a single test file or test by name:
+```sh
+cd packages/agent-react-devtools && npx vitest run src/__tests__/component-tree.test.ts
+cd packages/agent-react-devtools && npx vitest run -t "test name pattern"
+```
+
+## Project Structure
+
+Bun monorepo with workspaces: `packages/*` and `examples/*`.
+
+- `packages/agent-react-devtools/` — The only published package. Three build entry points via tsup:
+  1. **CLI + Daemon** (`src/cli.ts`, `src/daemon.ts`) — Node 22, ESM with shebang
+  2. **Connect script** (`src/connect.ts`) — Browser ESM, imported as `agent-react-devtools/connect`
+  3. **Vite plugin** (`src/vite-plugin.ts`) — Node 18, imported as `agent-react-devtools/vite`
+- `examples/vite-app/` and `examples/expo-app/` — Example apps (ignored by changesets)
+- `vendor/react/` — Git submodule (React Compiler), not part of the build
+
+## Architecture
+
+```
+CLI (cli.ts) ──→ IPC Client (daemon-client.ts) ──→ Unix Socket ──→ Daemon (daemon.ts)
+                                                                          │
+                                                           ┌──────────────┤
+                                                           ▼              ▼
+                                                    ComponentTree    Profiler
+                                                    (component-     (profiler.ts)
+                                                     tree.ts)
+                                                           ▲
+                                                           │
+                                              DevToolsBridge (devtools-bridge.ts)
+                                                    WebSocket ↔ React App
+```
+
+- **Daemon** (`daemon.ts`): Long-lived background process. Hosts an IPC server on a Unix socket (`~/.agent-react-devtools/daemon.sock`) and coordinates the bridge, tree, and profiler.
+- **DaemonClient** (`daemon-client.ts`): IPC client used by CLI. Auto-spawns the daemon as a detached process if not running.
+- **DevToolsBridge** (`devtools-bridge.ts`): WebSocket server implementing the React DevTools "Wall" protocol. Receives operations arrays from connected React apps.
+- **ComponentTree** (`component-tree.ts`): Parses React DevTools v2 binary operations arrays into an in-memory tree of `ComponentNode` objects.
+- **Profiler** (`profiler.ts`): Accumulates commit data from profiling sessions, computes render times and change causes.
+- **Formatters** (`formatters.ts`): Token-efficient text output for LLM consumption.
+- **Init** (`init.ts`): Framework detection (Vite/Next.js/CRA/RN) and auto-configuration for the `init` CLI command.
+
+IPC messages are newline-delimited JSON. WebSocket messages use `{event, payload}` shape.
+
+## React DevTools Protocol
+
+Operations array format: `[rendererID, rootFiberID, stringTableSize, ...stringTable, ...ops]`
+
+String table entries: `[length, ...charCodes]`. String ID 0 = null.
+
+Operation types: ADD (1), REMOVE (2), REORDER (3), UPDATE_BASE_DURATION (4), UPDATE_ERRORS_OR_WARNINGS (5), REMOVE_ROOT (6), SET_SUBTREE_MODE (7).
+
+Element types: CLASS=1, FUNCTION=5, FORWARD_REF=6, HOST=7, MEMO=8, PROFILER=10, ROOT=11, SUSPENSE=12.
+
+## Vite Integration
+
+`@vitejs/plugin-react` injects a `__REACT_DEVTOOLS_GLOBAL_HOOK__` stub that breaks react-devtools-core. The connect script (`connect.ts`) deletes this stub before initializing. Browser extensions may define the property as non-configurable, so deletion must be wrapped in try/catch.
+
+## Release Process
+
+Uses changesets for versioning. CI publishes to npm via OIDC (no token). Canary snapshots are published from unpublished changesets.
+
+## Testing
+
+Vitest with `globals: true` — `describe`, `it`, `expect` are available without imports. Test files live in `src/__tests__/`.
+
 ## Skills
 
 A skill is a set of local instructions stored in a `SKILL.md` file.

CLAUDE.md

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+@AGENTS.md