Set up branching structure and add branching rules to CLAUDE.md

Create develop branch from main and document the branching strategy
(main/develop/feature/*) in CLAUDE.md to enforce the workflow.

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

CLAUDE.md

@@ -1,3 +1,10 @@
+# Branching Strategy
+
+- **Never commit directly to `main`.** `main` is always production-ready.
+- Day-to-day work happens on `develop`.
+- New work is done on `feature/*` branches off `develop`.
+- Merge flow: `feature/*` → `develop` → `main`.
+
 # Instructions
 
 - After completing a task, always ask the user if they'd like to commit the changes.