codeck entry point. Scans local files for materials, shows pipeline
dashboard with diagnostic intelligence, guides user to the next step.
Use when the user says "codeck", "new deck", "make a presentation",
"make a deck", "new slides", "build a presentation", "export",
"speech", "script", or wants to start or continue a presentation
project. /codeck is the user-facing entry; legacy sub-skills are
internal modules.
