Release v3.15.0

Added

• cratis llm-context now gives every command an effect — read-only, local, mutating or destructive — and a requiresConfirmation flag, so agents and guards can tell observing commands from state-changing ones without keeping their own lists.
• The cratis llm-context --schema JSON Schema, the catalog's tips, the generated CHRONICLE.md safety notes and a new LLM Context reference page explain both fields and what each value means.