Find the arc of a talk's story before you start building the deck — turn a months-long pile of ideas into a spine, beats, and a say-once ledger through small, reactable cards. The thought-partnership phase that /keynote deck and build-pptx assume already happened. Triggers on "/writers-room", "writers room", "let's break the [event] talk", "help me figure out what this talk is", "drop an idea for…