Keep the fixture's doc to two lines (improvise-djcn)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze

crates/improvise-command/src/ui/reduce.rs

@@ -918,10 +918,8 @@ pub(crate) mod tests {
     /// to the same mutation lands, `Dirty` included.
     #[test]
     fn a_model_command_lands_where_its_keypress_lands() {
-        /// Two categories on different axes: a one-category fixture cannot tell
-        /// a transpose from a cycle (`doctrine(check_the_checker)`).
-        /// Cells and multi-entry view maps too: two `App`s are compared, so every
-        /// `HashMap` the fingerprint walks must hold 2+ entries (improvise-djcn).
+        /// Two categories on two axes, plus cells and 2+-entry view maps: why each
+        /// is needed is in `context/test-evidence/command.md` (improvise-djcn).
         fn pivoted() -> App {
             use crate::model::cell::{CellKey, CellValue};
             let mut app = app();