fix(web): address PR review (clean .md output, one MCP config source)

- .md output rewrites MDX-only syntax (Tabs, TabItem, asides, the MCP
  client component) into plain Markdown.
- MCP client setups live in one data file used by the landing page, the
  setup page and agents/install; the smoke-test claim names the five
  agents agent-smoke.sh actually drives (not Cursor).
- The landing page reads the version from Cargo.toml; the hand-copied BBCA
  data stays dated, and the design doc no longer promises capture.sh.
- MCP overview counts 11 tools plus the opt-in ownership_sync.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/content/docs/mcp/index.md

@@ -5,7 +5,7 @@ description: idx-mcp serves idx's stock and ownership data to AI agents over MCP
 
 `idx-mcp` is a [Model Context Protocol](https://modelcontextprotocol.io)
 server over stdio. It gives an agent the same data as the `idx` CLI, as
-[11 tools](/mcp/tools/): quotes, price history, screening, company data,
+[11 tools](/mcp/tools/) (plus an opt-in `ownership_sync`): quotes, price history, screening, company data,
 analysis, comparison, and the KSEI ownership queries.
 
 It shares idx's [config, cache and ownership database](/start/config/#files-idx-keeps),