docs: mark Research App as fully implemented (420/420 tests, 2026-03-22)
docs: add Research App pages and update Home - Home.md: add Research App section linking to new pages; add Ephemeris.UI.Avalonia to project READMEs table; expand description to mention the research platform goal - Research-App.md (new): comprehensive product requirements doc — user persona, UX principles, 3 user flows, 5 screen specs, simulation requirements, component list, 4-milestone feature roadmap, Phase 3 advanced features, MVP success criteria - Wireframes.md (new): screen-by-screen clickable wireframes for Home, Main Workspace, Scriptural Events, Comparison Mode, and Notes Panel; includes navigation structure and build order Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>