v0.13.0

Added

• Slack-powered promptfoo agent (crab pf serve) for Slack-driven target discovery
• Excalidraw plugin (crab draw) for collaborative whiteboarding
• GPT-5 reasoning support for crab pf
• Court/review support for starting fresh when a session already exists

Changed

• crab pf defaults to openai:gpt-5 with reasoning: low

Fixed

• crab pf test prompts now match provider input format