Claude Code Studio v7.13.1

Post-release review of 7.13.0 found five defects, two of them silent.

• A quoted placeholder corrupted the value it carried. --model "{model}" with
  a model chosen produced --model "'opus'" — the value is shell-escaped, so
  quoting it again nests the quotes and the CLI receives a model literally named
  'opus'. No error, wrong model.
• A repeated placeholder destroyed the command. --model={model},{model} with
  nothing chosen left claude,, and the comma became part of the executable name.
  Both had one cause: a regex cannot reason about token boundaries. Substitution now
  walks whitespace-separated tokens.
• The Kanban settings note was wrong three times over. It tried to describe which
  dials take effect, and no dial behaves the same on both engines except model:
  the API run forwards turns and effort but not mode, the subscription run forwards
  mode but not turns or effort, and agent applies only when a session is first
  created. The note now states only what holds in every combination, and the matrix
  is pinned in the test suite rather than restated in prose.
• Template spacing outside the placeholder is preserved — an earlier fix squeezed all
  whitespace, which rewrites --system "a b".