Takeaway: Next time I'd start the first prompt by asking for a full audit of what each bundling layer (parser, languages, themes) actually pulls in, instead of chasing library swaps first.
Takeaway: I'd start by pointing out the uncommitted package.json/pnpm-lock.yaml changes myself so the agent doesn't have to pause and ask — that stop-and-ask was reasonable but cost time I could've saved with more context up front.
Takeaway: Next time I'd open with the full picture up front - that I wanted a reusable, documented extension repo, not just a one-off fix - since a lot of turns went into restructuring folders and diagrams after I kept changing my mind.