docs(work): use workledger command name

Update work graph verification references from work to workledger.

work/northstars/NS-0001-testing-strategy.md

@@ -32,8 +32,8 @@ Make hemx verification boring and reliable by keeping a documented confidence la
 
 ## Verification
 
-- `work check`
-- `work list`
+- `workledger check`
+- `workledger list`
 - Later implementation slices choose the narrowest relevant command, then use `cargo run -p hemx-xtask -- test` when changing shared verification authority.
 
 ## Non-goals