Add emoji prefixes to Warning and Error output

README.md

@@ -404,8 +404,8 @@ Message classes:
 | Complete | `》` (green) | column 0 | An operation just finished (past-tense verb) |
 | Info | `》` (white) | column 0 | Neutral status update |
 | Notice | `》` (cyan) | column 0 | Important note that is not a warning |
-| Warning | `Warning:` (orange/yellow) | column 0 | Recoverable problem |
-| Error | `ERROR:` (red) | column 0 | Operation aborted |
+| Warning | `⚠️  Warning:` (orange/yellow) | column 0 | Recoverable problem |
+| Error | `❌ ERROR:` (red) | column 0 | Operation aborted |
 | Progress | `  》` (white) | column 2 | Heartbeat or per-item status during a long-running operation |
 
 Conventions:
@@ -446,7 +446,8 @@ ANSI escapes inline:
 
 When `NO_COLOR` is set or output is not a TTY, all helpers return plain
 text and the marker prefixes (`》`, `Warning:`, `ERROR:`) emit without
-ANSI escapes.
+ANSI escapes. The emoji prefixes on Warning and Error are always emitted
+regardless of color setting (emoji are not color).
 
 ## requirements