Add the FeatherSpec wiki Fifteen pages carrying the reference material the README no longer holds: getting started for both tools, all eight commands in detail, the spec and plan documents, the Memory Bank, the repository layout, configuration, extension, the interop matrix with its sources, the design decisions behind commands-not-skills and the single-source rule, ejection to one tool, migration from the predecessor template, troubleshooting, and an FAQ. Plus the workshop as a Hands-On Walkthrough: one complete SDD cycle on a tip splitter, PO and Dev alternating at the same keyboard.