Add CHANGELOG.md with the 2026.4.27 initial release entry, establishing the YYYY.MM.DD date-based versioning scheme used for all future Build New releases.

Author: Brian Casel

CHANGELOG.md

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+# Changelog
+
+Versions are numbered using the release date in `YYYY.MM.DD` format.
+
+## 2026.4.27 — 2026-04-27
+
+Initial release.
+
+- Rails 8 + Inertia.js + React 19 starter on PostgreSQL
+- TypeScript, Tailwind CSS 4, shadcn/ui (new-york), Vite 7
+- Authentication with sessions, signup, and password reset (Inertia-rendered)
+- Authenticated app shell: sidebar + header with profile dropdown
+- Dashboard, Settings, and Profile pages (email + password change from Profile)
+- Signup captures the browser's IANA timezone and stores it on the user
+- System-preference-based dark mode applied before first paint
+- Mobile-responsive layouts
+- `letter_opener` for previewing mail in development at `/letter_opener`
+- Solid Queue, Solid Cache, and Solid Cable consolidated into the primary Postgres database (no Redis, no separate cache/cable databases)
+- Per-clone database name derived from the project directory, so cloning the GitHub template gives each project its own Postgres database
+- `bin/setup` → `npm install` → `bin/dev` flow for fresh template clones