Anchor the cn-convert style exemption to the exact command

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Kb7vDj6PHwymeDeSUUk1eX

test/shell.d/bin-style-test.sh

@@ -6,7 +6,7 @@ source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
 
 # cn-convert is a curl-able bootstrap like upgrade-to-quattro: helpers may not exist yet
 raw_command_checks=$(rg -l 'command -v' "$ROOT/bin" \
-  | rg -v '/omarchy-(cmd-|pkg-|upgrade-to-quattro|cn-convert)' || true)
+  | rg -v '/omarchy-(cmd-|pkg-|upgrade-to-quattro|cn-convert$)' || true)
 [[ -z $raw_command_checks ]] || fail "bin commands use command helpers" "$raw_command_checks"
 pass "bin commands use command helpers"