docs: complete XML doc coverage (returns, summaries, inheritdoc)

Resolve all 622 issues flagged by the enhanced CommentChecker: add missing <returns> tags (incl. the standard phrasing on non-generic Task methods), add missing <summary> tags, and replace misused/redundant <inheritdoc/> on members that override or implement nothing with real documentation. Documentation-only — no behavior change; solution builds clean.
2026-06-03 11:39:32 -04:00
parent a050170414
commit eabf270d71
208 changed files with 867 additions and 114 deletions
@@ -20,6 +20,7 @@ public static class EmailAddressValidator
    /// </summary>
    /// <param name="fromAddress">The sender email address to validate.</param>
    /// <param name="recipients">The list of recipient addresses to validate.</param>
+    /// <returns>A human-readable error string if any address is malformed; <c>null</c> if all addresses parse successfully.</returns>
    public static string? ValidateAddresses(
        string fromAddress, IReadOnlyList<NotificationRecipient> recipients)
    {