Bolt-Era Codebase Analysis

Lifted from `augment-it-bolt/specs/Bolt-Codebase-Analysis.md` (the archive/bolt-code branch of lossless-group/augment-it). A comprehensive architectural analysis of the bolt monolith — React + TS + Vite + Supabase + zustand. Stale relative to the codebase we're rewriting toward, but a faithful map of the prior state and worth keeping as a reference for what the entity model and component graph looked like when it was working.