claude@clouddev1
151ed084a3
A parse error in `add index …` showed the `add column` usage: `add` and `drop` are multi-form commands, and both the ambient hint and the submit-time usage block picked the first-listed form unconditionally. New `grammar::usage_key_for_input` disambiguates by the form word after the entry keyword — `column` / `index` / `table` / `relationship`, or the leading digit of `add 1:n …`. The ambient hint now shows that one form; `render_usage_block` shows the committed form's usage and falls back to the whole family only for a bare `add` / `drop` with no form chosen.