Trading module now VN stocks only with dynamic symbol resolution. Update test counts (105), remove crypto/gold/forex references from project-level docs, update architecture file tree descriptions.
Add CLAUDE.md for AI assistant context. Create four new docs: deployment-guide.md (full deploy flow + secret rotation + rollback), code-standards.md (formatting, naming, module conventions, testing), codebase-summary.md (tech stack, modules, data flows, external APIs), development-roadmap.md (completed phases + planned work).
