chore: untrack .claude local artifacts

.claude/skills is now a symlink to the repo-root skills/ dir, so the
duplicate tracked copy under .claude/skills/ no longer exists on disk and
showed as a permanent deletion. Drop it from tracking and gitignore the
symlink plus the scheduled_tasks.lock runtime file.

.gitignore

@@ -56,4 +56,8 @@ storybook-static
 
 .svelte-kit/
 
-company/
+company/
+
+# Claude Code local artifacts
+.claude/skills
+.claude/scheduled_tasks.lock