feat: async pipeline, job queue, generation hardening, and docs

feat: AI interference levels (minimum|medium|maximum) UI, API, prompts, generation

feat: enhance embedding model configuration and retrieval logic

feat: introduce strict uploaded only mode and enhance logging for AI generation

fix: enhance section text update handling and validation

fix: notes-only generation to prevent RAG content leak

chore: update .gitignore and README for improved clarity and functionality

feat: adaptive writing style — user docs first, KB fallback, few-shot examples

- Added support for RICS survey levels (1, 2, 3) in document uploads and reports, allowing for better tier management and retrieval filtering.

Added canonical rollout functionality, including new API endpoints and request/response models for upgrading indexed content. Updated main application to include the canonical rollout router. Introduced a new document loading function for raw documents in the ingestion pipeline. This enhances content management and semantic upgrades across the application.

- Introduced a new API endpoint for finding similar content in the tenant's workspace, allowing users to identify overlapping uploads and draft notes.

- Replaced timezone.utc with UTC from datetime for consistent datetime handling.

feat: FAISS-only vector store (remove Chroma)

feat(experiment-lab): AI transparency bar, tenant-scoped RAG, citations, proofread/enhance fixes

- Updated `.env.example` to include new settings for bulk upload limits and batch processing.

feat: enhance document upload and processing capabilities with new personalisation features

fix: comprehensive codebase review fixes (critical + major + minor issues)

feat: scaffold complete RAG system for RICS-style report generation