add dev setup/run scripts and Resend test email docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -6,6 +6,17 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
 
+### Added
+- **Dev setup script** (`scripts/dev_setup.sh`) — interactive bootstrap that
+  checks prerequisites, installs deps, creates `.env` with auto-generated
+  `SECRET_KEY`, runs migrations, seeds test data, optionally sets up Paddle
+  sandbox products, and builds CSS
+- **Dev run script** (`scripts/dev_run.sh`) — starts app, worker, and CSS
+  watcher in parallel with colored/labeled output and clean Ctrl-C shutdown
+- **Resend test email docs** — documented Resend test addresses
+  (`delivered@resend.dev`, `bounced@resend.dev`, etc.) in `.env.example` and
+  README for testing email flows without a verified domain
+
 ### Fixed
 - **Quote wizard state loss** — `_accumulated` hidden input used `"` attribute
   delimiters which broke on `tojson` output containing literal `"` characters;