3f7abe0c95
- 9 rearrange scenarios with keyword matching (arpeggio, harmonies, syncopation, walking bass, jazz, synthwave, cinematic, simplify, chromatic) - detectRearrangeScenario() maps user prompt to specific technique rules - buildRearrangeMessage auto-injects scenario-specific technique guidance - 9 rearrange presets added to PromptTemplateManager (Rearrange / Variation)