Move the presentation implementation out of the skill string into real
TypeScript files (types.ts, presentation-generator.tsx) and add a
generatePresentation builtin tool so the agent calls it directly instead
of writing code. Rewrite the skill to guidance-only with content limits,
preference gathering, and JSON examples for each slide type.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>