lint: drop trailing '...' from usage error strings

staticcheck ST1005: error strings shouldn't end with punctuation.
Two tournament usage messages in commands.go + ctl.go had a trailing
'...' (illustrative, not literal); harmless to drop.

Author: css521

internal/cli/commands.go

@@ -262,7 +262,7 @@ func cmdTournament(r *repo.Repo, args []string) error {
 	base := flagValue(args, "--base")
 	test := flagValue(args, "--test")
 	if test == "" {
-		return fmt.Errorf("usage: agentenv tournament [--base <ref>] --test \"<cmd>\" [--keep] -- \"cand1\" \"cand2\" ...")
+		return fmt.Errorf("usage: agentenv tournament [--base <ref>] --test \"<cmd>\" [--keep] -- \"cand1\" \"cand2\"")
 	}
 	cands := after(args, "--")
 	if len(cands) == 0 {

internal/cli/ctl.go

@@ -67,7 +67,7 @@ func cmdCtl(args []string) error {
 		test := flagValue(a, "--test")
 		cands := after(a, "--")
 		if test == "" || len(cands) == 0 {
-			return fmt.Errorf("usage: agentenv ctl tournament [--base <ref>] --test \"<cmd>\" -- \"cand1\" \"cand2\" ...")
+			return fmt.Errorf("usage: agentenv ctl tournament [--base <ref>] --test \"<cmd>\" -- \"cand1\" \"cand2\"")
 		}
 		req["base"], req["test"] = base, test
 		var list []map[string]string