feat: JavaScript-first T.A.S.K.S. plan for DATA ESM refactor

Complete T.A.S.K.S. v3 planning artifacts for refactoring DATA to pure JavaScript ESM:

- Zero TypeScript, zero build steps - the code that runs is the code we write
- Runtime type safety via instanceof checks that actually execute
- AI-powered JSDoc generation for comprehensive documentation
- 12 tasks, 19-hour completion via rolling frontier execution
- Pure JavaScript packages: data-core (no I/O), data-host-node (adapters)
- Deno Edge Function template generation (but DATA runs on Node 20+)
- Full alignment with /docs/decisions/000-javascript-not-typescript.md

Key principles:
- "The needs of the runtime outweigh the needs of the compile time"
- JavaScript classes provide real runtime validation, not compile-time lies
- Stack traces point to actual source files, not transpiled artifacts
- AI generates perfect JSDoc on every commit

"Ship JavaScript. Skip the costume party." 🚀

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: flyingrobots