Only show the bootstrap prompt field on the agent configuration page when editing an existing agent that already has a bootstrapPromptTemplate value set. Label it as "(legacy)" with an amber notice recommending migration to prompt template or instructions file. Hidden entirely for new agent creation. Closes PAP-536 Co-Authored-By: Paperclip <noreply@paperclip.ing> Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>