perf(reporting, rag): optimize end-to-end latency and concurrent execution

feat(ingestion): implement document indexing, element chunking and verification engine

fix(reporting): keep reports in the stock's directory and sweep the scaffolding

refactor!: hosted-model-only core, Drive report delivery, shared harnesses

feat(ingestion): add the document ingestion layer with a resumable registry

test(reporting): add verification harness covering both guardrails

feat(reporting): assemble the typeset document and wire the CLI

refactor(retrieval): align section keys, remove hardcoded fallbacks, prune dead dependencies

refactor: modernize codebase to Pure Agentic RAG with live Vercel REST tools and Google Python Style Guide standards

Pure RAG architecture: Remove legacy scripts and use live Vercel REST API endpoints

Integrate LangChain financial data tools and connect to live Vercel REST data provider

Restructured the directory structure and updated coding format as PEP8