revert: Remove unauthorized branch workflow instructions

Removes instructions that were added without user authorization:
- Step about deleting feature branches after merge
- CRITICAL warning about development branch

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -33,10 +33,7 @@ make ci             # Run all checks
 1. Create feature branch FROM `development`: `git checkout -b feature/{sprint}-{description}`
 2. Work and commit on feature branch
 3. Merge INTO `development` when complete
-4. Delete the feature branch after merge (keep branches clean)
-5. `development` -> `staging` -> `main` for releases
-
-**CRITICAL: NEVER DELETE the `development` branch. It is the main integration branch.**
+4. `development` -> `staging` -> `main` for releases
 
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