fix(billing): use standard TURNSTILE_SECRET env var for Spin compliance

fix(billing): robust Turnstile verification with SKIP_CAPTCHA escape hatch and fail-open network fallback

fix: Turnstile CSP + Cerebras model slug + API key sanitization

refactor: rename chronos_core -> smriti_core, KAAL -> Smriti throughout backend

fix(chat/demo): remove memory search — bubble chat is a public guide bot only, no db access

fix(chat): lower similarity threshold to 0.70 and use raw_text for CSV-ingested data

feat: add /chat/demo endpoint to power KaalChat widget with memory

refactor: centralise all magic numbers into config.py driven by env vars

feat: bi-temporal supersession, scope isolation, configurable threshold, benchmark adapter

fix: billing body binding (Pydantic model), surface real error in WelcomeScreen

security: add Turnstile captcha + IP rate limiting + email dedup to key generation

feat: store Amber voice as base64 py constant to avoid binary in git, fix speaker_wav references in TTS route

feat: add XTTSv2 TTS endpoint + public demo chat with Amber voice, template-first responses, and Chronos memory consent storage

Rebrand to Kaal — rename from Chronos OS, add Logo component with serif seal design, swap all Hexagon icons for Logo

Security: Enforce strict tenant data isolation across all API routes (query, connectors, agent)

Fix: Resolve Cross-Origin Resource Sharing (CORS) pre-flight blocks for Vercel deployments via vercel.json and FastAPI router fixes

Diag: Add verbose logging and debug uvicorn CMD for HF deployment

Fix lint: Instantiate bearer_scheme in auth.py

Fix 401: Backend now supports both X-API-Key and Authorization: Bearer headers

Migrate Backend to Hugging Face Spaces (16GB RAM optimization)

Diag: Add timing logs to lifespan startup

Migrate to Vercel Next.js UI Frontend, prune 10x SVO model overhead payload

Migrate: SQLite+ChromaDB → Neon PostgreSQL+pgvector (persistent cloud storage)

10x Code Quality: Fix crash bug, cache LLM singletons, optimize batch inserts, purge stale references

Initial commit for Chronos OS MVP