MCP server reports hardcoded version 0.1.5 instead of actual CLI version

[devangpratap]

In internal/mcp/server.go, the initialize response has the server version hardcoded as "0.1.5":

"serverInfo": map[string]interface{}{
    "name":    "codag",
    "version": "0.1.5",
},

The actual CLI version is injected via ldflags in .goreleaser.yml into cmd.Version, but the MCP server never reads it. So every release since 0.1.5 has been reporting the wrong version to MCP clients.

Should be a one line fix, just wire cmd.Version (or pass it into NewServer/Serve) instead of the string literal. Happy to PR this.