refactor: strip to installer + doctor + docs, remove read/search wrapper layer

BREAKING CHANGE: Remove all `agent-reach read` and `agent-reach search-*` commands.

Agent Reach is now an installer, configuration tool, and doctor —
not a wrapper layer. After installation, agents call upstream tools
directly (bird CLI, yt-dlp, mcporter, gh CLI, Jina Reader, etc.).

What's kept:
- agent-reach install: one-shot installer
- agent-reach doctor: channel status overview
- agent-reach configure: cookies, proxy, credentials
- agent-reach setup: interactive wizard
- SKILL.md: complete guide for agents to use upstream tools directly

What's removed:
- agent-reach read URL (and all channel read() methods)
- agent-reach search-* commands (and all channel search() methods)
- ReadResult / SearchResult data classes
- URL routing system (get_channel_for_url)
- All parsing/conversion logic (VTT, Reddit JSON, bird text parser, etc.)
- MCP server read/search tools (kept only get_status)

Net change: -1790 lines. Less code = fewer bugs.

agent_reach/integrations/mcp_server.py

@@ -1,10 +1,11 @@
 # -*- coding: utf-8 -*-
 """
-Agent Reach MCP Server — expose all capabilities as MCP tools.
+Agent Reach MCP Server — expose doctor/status as MCP tool.
 
 Run: python -m agent_reach.integrations.mcp_server
 
-8 tools for any MCP-compatible AI Agent.
+Agent Reach is an installer + doctor tool. For actual reading/searching,
+agents should call upstream tools directly (bird, yt-dlp, mcporter, etc.).
 """
 
 import asyncio
@@ -35,50 +36,15 @@ def create_server():
     @server.list_tools()
     async def list_tools():
         return [
-            Tool(name="read_url",
-                 description="Read content from any URL. Supports: web, GitHub, Reddit, Twitter, YouTube, Bilibili, RSS.",
-                 inputSchema={"type": "object", "properties": {"url": {"type": "string"}}, "required": ["url"]}),
-            Tool(name="read_batch",
-                 description="Read multiple URLs concurrently.",
-                 inputSchema={"type": "object", "properties": {"urls": {"type": "array", "items": {"type": "string"}}}, "required": ["urls"]}),
-            Tool(name="detect_platform",
-                 description="Detect what platform a URL belongs to.",
-                 inputSchema={"type": "object", "properties": {"url": {"type": "string"}}, "required": ["url"]}),
-            Tool(name="search",
-                 description="Semantic web search via Exa.",
-                 inputSchema={"type": "object", "properties": {"query": {"type": "string"}, "num_results": {"type": "integer", "default": 5}}, "required": ["query"]}),
-            Tool(name="search_reddit",
-                 description="Search Reddit posts.",
-                 inputSchema={"type": "object", "properties": {"query": {"type": "string"}, "subreddit": {"type": "string"}, "limit": {"type": "integer", "default": 10}}, "required": ["query"]}),
-            Tool(name="search_github",
-                 description="Search GitHub repositories.",
-                 inputSchema={"type": "object", "properties": {"query": {"type": "string"}, "language": {"type": "string"}, "limit": {"type": "integer", "default": 5}}, "required": ["query"]}),
-            Tool(name="search_twitter",
-                 description="Search Twitter/X posts.",
-                 inputSchema={"type": "object", "properties": {"query": {"type": "string"}, "limit": {"type": "integer", "default": 10}}, "required": ["query"]}),
             Tool(name="get_status",
-                 description="Get Agent Reach status: which channels are active.",
+                 description="Get Agent Reach status: which channels are installed and active.",
                  inputSchema={"type": "object", "properties": {}}),
         ]
 
     @server.call_tool()
     async def call_tool(name: str, arguments: dict):
         try:
-            if name == "read_url":
-                result = await eyes.read(arguments["url"])
-            elif name == "read_batch":
-                result = await eyes.read_batch(arguments["urls"])
-            elif name == "detect_platform":
-                result = eyes.detect_platform(arguments["url"])
-            elif name == "search":
-                result = await eyes.search(arguments["query"], arguments.get("num_results", 5))
-            elif name == "search_reddit":
-                result = await eyes.search_reddit(arguments["query"], arguments.get("subreddit"), arguments.get("limit", 10))
-            elif name == "search_github":
-                result = await eyes.search_github(arguments["query"], arguments.get("language"), arguments.get("limit", 5))
-            elif name == "search_twitter":
-                result = await eyes.search_twitter(arguments["query"], arguments.get("limit", 10))
-            elif name == "get_status":
+            if name == "get_status":
                 result = eyes.doctor_report()
             else:
                 result = f"Unknown tool: {name}"