fix: Decouple A/V providers in AIService and refactor routes for robustness

feat: Implement Multi-AI Architecture with Google Gemini provider and failover logic

feat(ai): refactor coach feedback to 3-pillar format with mandatory browsing (Sprint 39)

chore: execute Sprint 38 technical debt resolution (Type Safety, Zod validation, Vitest, Mock LLM extracted)

feat: Genspark-Standard upgrade, MLOps audit fixes, and XAMLÉ branding

feat(admin): build Ground Truth Training Lab to calculate WER and capture dictionary improvements

feat(api): add whisper confidence calibration script and endpoint

fix(api): remove redundant /admin prefix in admin routes to fix dashboard 404

feat(ai): integrate Whisper STT confidence score for auto-validation

feat(admin): add viewing full chat history in user list

feat(admin): human-in-the-loop dashboard base, add PENDING_REVIEW logic and audio overdrive worker

fix(ai): update validation schemas and types to properly handle null context parameters for new users

feat(ai): expert coaching system with persistent business context and explicit SUITE progression fix

fix(stt): resolve post-transcription silence and harden gateway detection

fix(logic): prioritize commands over exercises and strictly lock gateway routing

feat(hardening): implement anti-silence, gateway loop protection and deep trace logging

Fix gateway forwarding authorization: use Bearer token instead of x-admin-key

Fix Post-STT Blockage: Async chain, Intent detection, and Feedback fallback

feat(ai): fully operational v1.0 criteria engine and 5-level curriculum (10 modules)

feat(pedagogy): implementation of dynamic content infrastructure and evaluation criteria

fix: improve STT suspect detection regex

feat: localize AI documents (FR/WO) and fix Zod warnings

feat: implement adaptive pedagogy, visuals, and remediation (WOW Phase 1)

feat: implement WOW Sprint 1 (BusinessProfile, Structured Feedback, STT Hardening, Progress Bar)

feat: audit and hardening of audio pipeline, AI localization, and WhatsApp UX improvements

build: force deep rebuild v4 with improved logging

debug: add detailed logging for transcription connection error

fix(audio): Ensure /tmp/audio exists and fix nixpacks syntax

feat(audio): Enforce strict AI_API_BASE_URL and add FFmpeg MP3 STT conversion

feat(audio): Complete robust outbound/inbound pipeline and async AI generation

fix: Prevent HF webhook from pushing empty Whatsapp access token to Railway worker

fix: Split Webhook into Gateway (HuggingFace) and Processor (Railway), fix missing https:// in API_URL

feat: implement STT inbound audio, TTS fallback, and Interactive Lists

feat(prod): implementation of missing features for production readiness

fix(audit): 6 bugs fixed — static imports, store-audio endpoint, CONTINUE fallthrough, SUITE regex, no more require() calls

fix(audit): add /v1/ai/transcribe endpoint + fix cross-package storage require in worker

feat(arch): interactive LIST menu, audio download-media job, OpenAI 429 fallback, DAY action IDs

fix(whatsapp): remove httpsAgent IPv4 constraint causing ENOTFOUND and timeouts on Railway

feat(whatsapp): implement interactive pedagogy architecture with Voice and Button routing

fix: explicit httpsAgent with family 4 for Axios to bypass docker IPv6 ENOTFOUND

fix: replace native fetch with axios to fix Node 20 ipv6 DNS ENOTFOUND in Docker

fix: cast meta.json() to typed interface to fix TS18046 strict error

feat: admin auth login, real WhatsApp Cloud API, Cloudflare R2 storage

fix(security): audit fixes — Stripe webhook scope, fail-fast secrets, prisma singleton, worker auth, Zod validation, WA number env var

fix(types): remove per-route rateLimit config and fix content-type parser done() types

feat(security): API key auth, HMAC webhook verification, rate limiting, Zod validation

fix(whatsapp): handle parameterless health check pings from meta webhook

fix(whatsapp): strict text/plain response for Meta webhook verification

feat: sync all recent changes (AI, whatsapp, redis passwords, script fixes)

feat(payment): integrate stripe checkout, webhooks, and worker dispatch