EffectiveSettingsMojo mutates original Settings when showPasswords=true

In src/main/java/org/apache/maven/plugins/help/EffectiveSettingsMojo.java:87-94:

if (showPasswords) {
copySettings = settings; // uses original, not a copy
} else {
copySettings = copySettings(settings);
}
writeEffectiveSettings(copySettings, writer); // calls cleanSettings() which modifies profiles

When -DshowPasswords=true, the original Maven Settings object is used directly. writeEffectiveSettings -> cleanSettings() then replaces each profile Properties with a SortedProperties instance (same pattern as bug #381), mutating the global shared settings object.

Start in src/main/java/org/apache/maven/plugins/help/EffectiveSettingsMojo.java:87-94 and trace writeEffectiveSettings() into cleanSettings(). Verify the showPasswords=true path does not pass the shared Settings object to the mutating cleanup, and confirm the original profiles and Properties remain unchanged after writing effective settings.

Written by the indexing model from the issue text.