Build a dark factory

What the user typed: $ARGUMENTS

Work out the PRD path and the repo path from that line yourself, and do not print a parse you have not checked. The positional split is on whitespace, so anyone who types a sentence ("build a dark factory for my repo at C:\code\thing") gets the first two words as the two paths - three separate test runs opened with PRD: Build and Repo: a, which is a broken-looking first contact for a parse the skill then quietly recovered from anyway.

So: read the line, find the thing that looks like a .md PRD and the thing that looks like a directory, and confirm both back to the user as one sentence before Phase 0. If only one is given, work out from its extension which it is and ask for the other. If the PRD path does not exist, say so and stop - that is Phase 0a, reached early.