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>

code-reviews/Driver.Cli.Common/findings.md

@@ -7,7 +7,7 @@
 | Review date | 2026-05-22 |
 | Commit reviewed | `76d35d1` |
 | Status | Reviewed |
-| Open findings | 2 |
+| Open findings | 0 |
 
 ## Checklist coverage
 
@@ -130,7 +130,7 @@ dispose the previous logger if reconfiguration is genuinely intended.
 | Severity | Low |
 | Category | Error handling & resilience |
 | Location | `src/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.Cli.Common/SnapshotFormatter.cs:68-70` |
-| Status | Open |
+| Status | Resolved |
 
 **Description:** `FormatTable` calls `rows.Max(r => r.Tag.Length)` (and the same for the
 value and status columns) without guarding against empty input. When `tagNames` and
@@ -143,7 +143,13 @@ instead of producing an empty (header-only) table.
 separator, or an explicit "no rows" line), or use `DefaultIfEmpty(0).Max(...)` for the
 width computations.
 
-**Resolution:** _(open)_
+**Resolution:** Resolved 2026-05-23 — `FormatTable` guards each `rows.Max(...)` width
+computation with a `rows.Length == 0 ? "<HEADER>".Length : Math.Max(...)` ternary, so
+an empty batch read returns the header + separator rows (no data rows) instead of
+throwing `InvalidOperationException`. The fix was landed in commit `1433a1c` alongside
+the -002 work, and the regression test
+`SnapshotFormatterTests.FormatTable_with_empty_input_returns_header_only` (added under
+-005) exercises it.
 
 ### Driver.Cli.Common-005
 
@@ -178,7 +184,7 @@ empty-input and `DriverCommandBase` level-selection tests.
 | Severity | Low |
 | Category | Documentation & comments |
 | Location | `src/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.Cli.Common/SnapshotFormatter.cs:71`, `src/Drivers/Cli/ZB.MOM.WW.OtOpcUa.Driver.Cli.Common/DriverCommandBase.cs:9` |
-| Status | Open |
+| Status | Resolved |
 
 **Description:** Two minor doc inaccuracies. (1) The comment at `SnapshotFormatter.cs:71`
 states the "source-time column is fixed-width (ISO-8601 to ms) so no max-measurement
@@ -194,4 +200,8 @@ library. The XML doc is stale relative to the shipped driver-CLI set.
 right-most and intentionally unpadded rather than claiming fixed width. Add FOCAS to the
 `DriverCommandBase` class-summary driver list.
 
-**Resolution:** _(open)_
+**Resolution:** Resolved 2026-05-23 — (1) `SnapshotFormatter.cs:71` comment reworded
+to state the source-time column is the right-most one and intentionally not
+measured/padded, calling out the null-timestamp `"-"` case explicitly. (2) FOCAS was
+added to the `DriverCommandBase` class-summary driver enumeration in commit `7ff356b`
+(landed alongside the -003 work).

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("  ")