docs: overhaul READMEs across all major packages (#594)

* docs: overhaul READMEs across all major packages

- Root README: restructure with feature table, LLM provider table,
  comparison matrix, architecture map, and docs link
- New: packages/browseros/README.md (Chromium fork build system)
- New: apps/server/README.md (MCP server + agent loop)
- New: packages/cdp-protocol/README.md (CDP type bindings)
- Polish: agent-sdk (badges, prerequisites, multi-step example, links)
- Polish: cli (badges, install section, MCP server section, links)
- Polish: agent extension (badges, WXT mention, architecture context)
- Polish: eval (badges, paper links)

* fix: address review — consistent tool count and correct default port

- CLI README: "54 MCP tools" → "53+ MCP tools" to match root and server docs
- Agent SDK README: localhost:3000 → localhost:9100 to match documented default

* docs: add detailed comparison links to How We Compare section

* docs: update comparison table with verified competitor data

Research all 5 competitors via official websites and docs:
- Chrome: no AI agent, Gemini Nano only, MV3 weakening ad blocking
- Brave: BYOM feature, local models via BYOM, Shields ad blocking, MV2+MV3
- Dia: Skills-based AI, no BYOK, cloud AI, acquired by Atlassian
- Comet: full cloud-based agent, built-in ad blocking, extensions on desktop
- Atlas: standalone Chromium browser with Agent Mode, 30-day cloud memory

Renamed Arc/Dia column to just Dia (Arc is sunset).

* docs: simplify comparison table with clean checkmarks and key differentiators

* docs: update browseros-agent README — remove submodule note, add missing packages

packages/browseros-agent/README.md

@@ -1,8 +1,6 @@
 # BrowserOS Agent
 
-Monorepo for the BrowserOS-agent -- contains 3 packages: agent-UI, server (which contains the agent loop) and controller-extension (which is used by the tools within the agent loop).
-
-> **⚠️ NOTE:** This is only a submodule, the main project is at -- https://github.com/browseros-ai/BrowserOS
+The agent platform powering [BrowserOS](https://github.com/browseros-ai/BrowserOS) — contains the MCP server, agent UI, CLI, evaluation framework, and SDK.
 
 ## Monorepo Structure
 
@@ -10,17 +8,25 @@ Monorepo for the BrowserOS-agent -- contains 3 packages: agent-UI, server (which
 apps/
   server/          # Bun server - MCP endpoints + agent loop
   agent/           # Agent UI (Chrome extension)
+  cli/             # Go CLI for controlling BrowserOS from the terminal
+  eval/            # Evaluation framework for benchmarking agents
   controller-ext/  # BrowserOS Controller (Chrome extension for chrome.* APIs)
 
 packages/
+  agent-sdk/       # Node.js SDK (@browseros-ai/agent-sdk)
+  cdp-protocol/    # Type-safe Chrome DevTools Protocol bindings
   shared/          # Shared constants (ports, timeouts, limits)
 ```
 
 | Package | Description |
 |---------|-------------|
 | `apps/server` | Bun server exposing MCP tools and running the agent loop |
-| `apps/agent` | Agent UI - Chrome extension for the chat interface |
-| `apps/controller-ext` | BrowserOS Controller - Chrome extension that bridges `chrome.*` APIs (tabs, bookmarks, history) to the server via WebSocket |
+| `apps/agent` | Agent UI — Chrome extension for the chat interface |
+| `apps/cli` | Go CLI — control BrowserOS from the terminal or AI coding agents |
+| `apps/eval` | Benchmark framework — WebVoyager, Mind2Web evaluation |
+| `apps/controller-ext` | BrowserOS Controller — bridges `chrome.*` APIs to the server via WebSocket |
+| `packages/agent-sdk` | Node.js SDK for browser automation with natural language |
+| `packages/cdp-protocol` | Auto-generated CDP type bindings used by the server |
 | `packages/shared` | Shared constants used across packages |
 
 ## Architecture