docs(readme): add badge row + LICENSE, fix stale design line

- Add badge row (live demo, Python 3.12+, tests, 94.0% EA, MIT)
- Add MIT LICENSE file; README license section now points to it
- Status line described the superseded Inter/indigo UI; align with the
  current editorial-warm redesign (details live in the UI section)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: JuliaEdom

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Julia Edomskikh
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1,8 +1,10 @@
 # NL→SQL Assistant
 
+[![Live demo](https://img.shields.io/badge/live_demo-HF_Space-FF6F00?logo=huggingface&logoColor=white)](https://liovina-nl-sql.hf.space) ![Python](https://img.shields.io/badge/python-3.12+-3776AB?logo=python&logoColor=white) ![Tests](https://img.shields.io/badge/tests-316_passing-brightgreen) ![BIRD Mini-Dev](https://img.shields.io/badge/BIRD_Mini--Dev-94.0%25_EA-brightgreen) ![License](https://img.shields.io/badge/license-MIT-blue)
+
 Portfolio demo для Senior Data Engineer / Data Analyst. Принимает вопрос на естественном языке (RU/EN), возвращает ответ из реляционной БД в одной из четырёх форм: число, предложение, таблица, график. Всегда показывает использованный SQL и объяснение. AST-guard + read-only execution + row cap — без шанса на DML/DDL побег.
 
-**Статус:** Stages 1–10 закрыты + grounded-critique directed retry + multi-provider voting + Sonnet 4.6 bridge через GraceKelly + production FastAPI surface + редизайн Streamlit UI (EN/RU toggle, современный светлый стиль — Inter, indigo-акцент, sticky top bar, 2026-06-16). **316 тестов зелёные**, ruff/mypy strict clean. Live API verified: Mistral + Groq + Perplexity Pro.
+**Статус:** Stages 1–10 закрыты. Production FastAPI surface, hybrid retrieval (grounded-critique directed retry + multi-provider voting + Sonnet 4.6 bridge через GraceKelly), редизайн Streamlit UI с EN/RU-переключателем (детали дизайна — в разделе UI ниже). **316 тестов зелёные**, ruff / mypy --strict clean. Live API verified: Mistral + Groq + Perplexity Pro.
 
 **Headline metrics**
 
@@ -115,4 +117,4 @@ For the public Streamlit Cloud demo (free, ~5 min setup), see
 
 ## License
 
-MIT (TBD).
+MIT. See [LICENSE](LICENSE).