Stop tracking local .claude/ session state

Accidentally committed .claude/scheduled_tasks.lock (a local runtime lock);
remove it and gitignore the .claude/ directory.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: ferbsx

.claude/scheduled_tasks.lock

@@ -4,3 +4,6 @@ _site
 .jekyll-metadata
 vendor
 .DS_Store
+
+# Local Claude Code session state
+.claude/