feat(bd-91j1): enhance robot-docs with quick_start and example_output

Add quick_start section with glab equivalents, lore-exclusive features,
and read/write split guidance. Add example_output to issues, mrs, search,
and who commands. Update strip_schemas to also strip example_output in
brief mode. Update beads tracking state.

Closes: bd-91j1

src/cli/robot.rs

@@ -77,6 +77,7 @@ pub fn strip_schemas(commands: &mut serde_json::Value) {
         for (_cmd_name, cmd) in map.iter_mut() {
             if let Some(obj) = cmd.as_object_mut() {
                 obj.remove("response_schema");
+                obj.remove("example_output");
             }
         }
     }