Release v7.1.0: Enhanced AI Playground

- Bump version to 7.1.0
- AI Playground: Chat mode with context (workflows, DBs, system, vectors)
- AI Playground: Tasks (classify, extract entities, summarize, sentiment)
- Context aggregator and Ollama integration
- Document upload and hash-based embedding; semantic search in Vector UI
- NL to SQL bridge (read-only, mock results)
- RELEASE_NOTES_v7.1.0.md

Docs: update SETUP_GUIDE for v7.0

Zixir v6.1.0 — Bug fixes (memory backend, binary encoding, observabil…

…ity, Ecto removal, tests, checkpoint ordering, state loading)

v6.0.0: VectorDB 9 backends (pgvector, redis, azure), cloud resilience

release: v5.3.0 (minor) — installer improvements, version bump, relea…

…se notes

fix(installer): Windows/CUDA installer - production script, logging, …

…-SkipCUDA, cleanup

Zixir v5.1.0 — Hotfix: shared utils, dedup, config, engine retry fix

v5.0.0 — Portable CLI, setup fixes, and redeploy

Zixir v4.0.0 — Compiler, type system, MLIR improvements

v3.0.0 - AI automation: workflows, sandbox, stream, observability, ca…

…che; universal improvements