Replace scaffold placeholders with full skill content: - bevy-0.19: ECS cheat sheet, critical traps table, architecture guide, and 7 reference files - bevy-upgrade: version migration workflow, transition references for 0.15→0.19, and 3 per-bump reference files
Add plugin skeleton with versioned skill directories, TODO SKILL.md scaffolds with goals for skill-creator, and copy over bevy-skill-research reports from spacecraft into docs/workpad/research/.
g4borg