fix(mcp): read version from package.json instead of hardcoding

[fxstein]

Problem

The MCP server reports version: "0.9.9" in its initialize handshake regardless of the actual installed version. The value is hardcoded in src/mcp/server.ts and was never updated across the 1.x and 2.x release trains:

const server = new McpServer(
  { name: "qmd", version: "0.9.9" },  // hardcoded
);

Any tooling or agent that reads serverInfo.version from the MCP handshake gets a stale value.

Fix

Read version from package.json at startup via a getPackageVersion() helper. Falls back to "unknown" if the file can't be read. Path resolution accounts for the compiled output location (dist/mcp/server.js → ../../package.json).

Testing

Built and tested locally. MCP initialize response now returns the correct version from package.json:

	Before	After
serverInfo.version	0.9.9	2.0.1

Verified via a benchmark script that connects directly to the MCP HTTP transport and reads the initialize response.

Environment

• QMD: v2.0.1
• Platform: macOS (Apple Silicon)
• Node: v24.2.0