fix: advertise the current package version to MCP clients

[cybercraftsolutionsllc]

Fixes #14.

Summary:

• move the package/server version into a small shared module
• use that same server info object for the MCP Server initialize metadata
• add a node:test regression that compares the advertised server version against package.json

Validation:

• npm ci --ignore-scripts
• npm test
• git diff --check

Payout route if needed: 0xB34D185318b34ec2F9E060F662Cc7feA3180049c