feat: stabilize AI engine, harden Zod schemas, and implement UX guardrails

fix: Update Gemini model names and harden transcription body reader

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

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

fix(whatsapp): Sprint 42 - Sécurisation routage Deep Dive et immuabilité secteur

fix(ai): Sprint 41 - Détanchéité linguistique Wolof stricte et réinjection boucle Deep Dive

feat(Sprint 40): Boucle interactive Deep Dive & persistences des réponses

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

fix(core): remove AI jus-de-fruits hallucination, expand onboarding sectors to 8, streamline pedagogy menu and lock REPRISE badge

feat(ai): integrate XAMLÉ v2 prompt guidelines including anti-hallucination constraints and strict Wolof normalization

fix(ai): remove hardcoded sector examples from system prompts to prevent AI hallucinations across mismatched domains

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

feat(wolof): standardized tracks T1-T5 with glossary v4.0 and implemented adaptive multi-sector architecture

chore: final logic hardening, AI prompt reinforcement and SUITE command fix

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

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

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

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

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

feat(railway): combined API+Worker Dockerfile + fix list char limits + 10s AI timeout

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

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

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

feat: implement AI document generation (mock, pdf, pptx) and worker integration