Stop tracking .mcp.json — it is generated at runtime

The server writes .mcp.json with its current port on startup and
during worktree creation. Tracking it in git causes QA gate failures
when the worktree copy diverges from master (e.g. different port).

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

.gitignore

@@ -1,5 +1,6 @@
 # Claude Code
 .claude/settings.local.json
+.mcp.json
 
 # Local environment (secrets)
 .env

.mcp.json

@@ -1,8 +0,0 @@
-{
-  "mcpServers": {
-    "story-kit": {
-      "type": "http",
-      "url": "http://localhost:3001/mcp"
-    }
-  }
-}