The ecosystem graph now lives at vercel.md (root). Remove the redundant
assets/ directory and update all references in the validator, tests, and
README.
Rules (.mdc files) aren't supported by Claude Code's plugin system — they
were silently ignored. Move the ecosystem knowledge graph and all three
convention sets (Next.js 16, AI SDK v6, Vercel platform) into CLAUDE.md
so they're always loaded into context.
Also updates repo references from anthropics/open-plugin to
vercel-labs/vercel-plugin.