feat: add backlog and AI workflow documentation, remove old features todo, and correct CSS import order.

Author: rek

docs/backlog.md

@@ -0,0 +1,24 @@
+# Backlog
+
+To assign work to an agent, say: **"Read docs/backlog.md and do item N"**
+
+Follow the [AI Workflow](../guide/ai-workflow.md) (orient → design → plan → implement → validate → wrap up).
+All items: remove when resolved
+
+At the end: update design doc status → Implemented, update specs to match what was actually built, update `implementation-status.md`, then review and add any learnings to `docs/guide/ai-workflow.md`.
+
+---
+
+## 1
+
+review builder page. do available options change when i make selections? hiding incompatiable things?
+
+## 2
+
+[vite:css][postcss] @import must precede all other statements (besides @charset or empty @layer)
+1170 | }
+1171 | }
+1172 | @import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700;800&family=IBM+Plex+Sans:wg...
+| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+1173 | :root {
+1174 | --color-bg-primary: #f5f3ee;

docs/guide/ai-workflow.md

@@ -1,5 +1,5 @@
-@import 'tailwindcss';
 @import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700;800&family=IBM+Plex+Sans:wght@400;500;600;700&family=Nunito:wght@400;500;600;700;800&display=swap');
+@import 'tailwindcss';
 
 /* Default theme: Vintage Catalog */
 :root {