Publish to npm as @salishforge/memforge

[salishforge]

Package.json configured with exports, bin entries, and files list. Need npm account for @salishforge scope, GitHub Actions publish workflow on tag push, verify npm pack output. See BACKLOG.md #5.

[salishforge]

Shipped as part of v3.0.0-beta.3. Package live at https://www.npmjs.com/package/@salishforge/memforge. CI release workflow and npm Trusted Publishing setup also in place.