fix(cli): use MCP tool for feature persistence in expand-project

Replace JSON output approach with direct MCP tool call in the
/expand-project CLI command to fix feature persistence issue.

Changes:
- Update expand-project.md to call feature_create_bulk MCP tool
- Remove <features_to_create> JSON tag output (not parsed in CLI)
- Simplify confirmation message before feature creation

Why:
- CLI users running /expand-project had features displayed but never
  saved to database because nothing parsed the JSON output
- Web UI is unaffected (uses expand_chat_session.py with its own parser)
- This mirrors how initializer_prompt.template.md already works

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

.claude/commands/expand-project.md

@@ -130,23 +130,16 @@ For each new capability, estimate features:
 
 # FEATURE CREATION
 
-Once the user approves, create features directly.
+Once the user approves, create features using the MCP tool.
 
 **Signal that you're ready to create features by saying:**
 
-> "Great! I'll create these N features now. Each feature will include:
+> "Great! I'll create these N features now."
-> - Category
-> - Name (what's being tested)
-> - Description (how to verify it)
-> - Test steps
->
-> Creating features..."
 
-**Then output the features in this exact JSON format (the system will parse this):**
+**Then call the `feature_create_bulk` tool to save them directly to the database:**
 
-```json
+```
-<features_to_create>
+feature_create_bulk(features=[
-[
   {
     "category": "functional",
     "name": "Brief feature name",
@@ -167,15 +160,15 @@ Once the user approves, create features directly.
       "Step 3: Verify styling"
     ]
   }
-]
+])
-</features_to_create>
 ```
 
 **CRITICAL:**
-- Wrap the JSON array in `<features_to_create>` tags exactly as shown
+- Call the `feature_create_bulk` MCP tool with ALL features at once
 - Use valid JSON (double quotes, no trailing commas)
 - Include ALL features you promised to create
 - Each feature needs: category, name, description, steps (array of strings)
+- The tool will return the count of created features - verify it matches your expected count
 
 ---