native (#594)

* Native Rust rewrite of agent-browser daemon

Single-binary Rust implementation replacing the Node.js/Playwright daemon
with direct CDP (Chrome DevTools Protocol) communication. Includes full
command parity, WebDriver/Safari/iOS backend routing, request tracking,
frame context management, CDP protocol codegen, and comprehensive tests.

* improvements

* fix ci

* fixes

* faster builds

AGENTS.md

@@ -26,6 +26,57 @@ This applies to changes that either human users or AI agents would need to know
 
 In the `docs/src/app/` MDX files, always use HTML `<table>` syntax for tables (not markdown pipe tables). This matches the existing convention across the docs site.
 
+## Dual Architecture (Node.js + Native)
+
+The codebase has two daemon implementations:
+
+- **Node.js/Playwright** (default) -- `src/daemon.ts`, `src/actions.ts`, `src/browser.ts`, and the rest of `src/`
+- **Rust/Native** (experimental, `--native` or `AGENT_BROWSER_NATIVE=1`) -- `cli/src/native/daemon.rs`, `cli/src/native/actions.rs`, `cli/src/native/browser.rs`, and the rest of `cli/src/native/`
+
+When modifying browser automation logic (commands, actions, protocol handling), changes **must** be made in **both** paths:
+
+| Node.js Path | Native Path |
+|---|---|
+| `src/actions.ts` | `cli/src/native/actions.rs` |
+| `src/browser.ts` | `cli/src/native/browser.rs` |
+| `src/daemon.ts` | `cli/src/native/daemon.rs` |
+| `src/protocol.ts` | `cli/src/native/cdp/client.rs` |
+| `src/snapshot.ts` | `cli/src/native/snapshot.rs` |
+| `src/state-utils.ts` | `cli/src/native/state.rs` |
+
+New commands must be implemented in both paths, or explicitly stubbed in the native path with a clear `"Not yet implemented: {action}"` error. The goal is eventual full migration to native, but until then both paths must stay in sync.
+
+## Testing
+
+### Unit Tests
+
+```bash
+cd cli && cargo test
+```
+
+Runs all unit tests (~320 tests). These are fast and don't require Chrome.
+
+### End-to-End Tests
+
+```bash
+cd cli && cargo test e2e -- --ignored --test-threads=1
+```
+
+Runs 18 e2e tests that launch real headless Chrome instances and exercise the full native daemon command pipeline. Requirements:
+
+- Chrome must be installed
+- Must run serially (`--test-threads=1`) to avoid Chrome instance contention
+- Tests are `#[ignore]`'d so they don't run during normal `cargo test`
+
+The e2e tests live in `cli/src/native/e2e_tests.rs` and cover: launch/close, navigation, snapshots, screenshots, form interaction, cookies, storage, tabs, element queries, viewport/emulation, domain filtering, diff, state management, error handling, and Phase 8 commands.
+
+### Linting and Formatting
+
+```bash
+cd cli && cargo fmt -- --check   # Check formatting
+cd cli && cargo clippy            # Lint
+```
+
 <!-- opensrc:start -->
 
 ## Source Code Reference