fix(driver-cli-common): resolve Low code-review findings (Driver.Cli.Common-004,006)

- Driver.Cli.Common-004: confirm the FormatTable empty-input guard
  landed earlier (commit 1433a1c); flip status to Resolved with a
  cross-reference.
- Driver.Cli.Common-006: reword the SnapshotFormatter source-time
  column comment to describe the actual behaviour (right-most column,
  unmeasured, '-' for null timestamps) and confirm the
  DriverCommandBase summary now enumerates FOCAS.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.Cli.Common/SnapshotFormatter.cs

@@ -68,7 +68,10 @@ public static class SnapshotFormatter
         int tagW = rows.Length == 0 ? "TAG".Length : Math.Max("TAG".Length, rows.Max(r => r.Tag.Length));
         int valW = rows.Length == 0 ? "VALUE".Length : Math.Max("VALUE".Length, rows.Max(r => r.Value.Length));
         int statW = rows.Length == 0 ? "STATUS".Length : Math.Max("STATUS".Length, rows.Max(r => r.Status.Length));
-        // source-time column is fixed-width (ISO-8601 to ms) so no max-measurement needed.
+        // source-time is the right-most column, so it is intentionally not measured or padded;
+        // when a snapshot has a non-null SourceTimestampUtc the cell is 24 chars (ISO-8601 to ms),
+        // and when the timestamp is null FormatTimestamp emits "-" — the resulting unalignment is
+        // harmless because nothing is appended after this column.
 
         var sb = new System.Text.StringBuilder();
         sb.Append("TAG".PadRight(tagW)).Append("  ")