fix(driver-abcip-cli): resolve Low code-review findings (Driver.AbCip.Cli-003,004,005,006,007,008)

- Driver.AbCip.Cli-003: SubscribeCommand prints the 'Subscribed' banner
  BEFORE wiring OnDataChange so the main thread can't interleave its
  write with the poll-thread handler.
- Driver.AbCip.Cli-004: AbCipCommandBase.Timeout and SubscribeCommand
  validate TimeoutMs / IntervalMs and throw CommandException on
  non-positive values.
- Driver.AbCip.Cli-005: every command now calls FlushLogging() in its
  finally block.
- Driver.AbCip.Cli-006: Timeout init throws NotSupportedException with a
  pointer at TimeoutMs instead of silently swallowing assignments.
- Driver.AbCip.Cli-007: added AbCipCommandBaseTests covering BuildOptions
  shape, probe / controller-browse / alarm toggles, host address, family
  selection, tag list passthrough.
- Driver.AbCip.Cli-008: rewrote the opening paragraph in
  docs/Driver.AbCip.Cli.md to credit the six-CLI roster with a pointer
  at docs/DriverClis.md.

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

docs/Driver.AbCip.Cli.md

@@ -4,8 +4,9 @@ Ad-hoc probe / read / write / subscribe tool for ControlLogix / CompactLogix /
 Micro800 / GuardLogix PLCs, talking to the **same** `AbCipDriver` the OtOpcUa
 server uses (libplctag under the hood).
 
-Second of four driver test-client CLIs (Modbus → AB CIP → AB Legacy → S7 →
-TwinCAT). Shares `Driver.Cli.Common` with the others.
+Second of six driver test-client CLIs (Modbus → AB CIP → AB Legacy → S7 →
+TwinCAT → FOCAS). Shares `Driver.Cli.Common` with the others; see
+[DriverClis.md](DriverClis.md) for the authoritative roster.
 
 ## Build + run