docs(driver-twincat): update findings.md status fields and open count

Mark findings 003, 009, 010, 011, 012 Status: Resolved (status fields
were missing the update in earlier commits); reduce Open findings
count from 11 to 5 (Low findings 004, 006, 014, 015, 016 remain open).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

code-reviews/Driver.TwinCAT/findings.md

@@ -7,7 +7,7 @@
 | Review date | 2026-05-22 |
 | Commit reviewed | `76d35d1` |
 | Status | Reviewed |
-| Open findings | 11 |
+| Open findings | 5 |
 
 ## Checklist coverage
 
@@ -88,7 +88,7 @@ to `UInt16`, and `USInt`/`SInt` to their natural widths. Remove the stale "Int64
 | Severity | Medium |
 | Category | Correctness & logic bugs |
 | Location | `AdsTwinCATClient.cs:264-281`, `283-300` |
-| Status | Open |
+| Status | Resolved |
 
 **Description:** `MapToClrType` has a `_ => typeof(int)` fallthrough and `ConvertForWrite` has
 a `_ => throw NotSupportedException` fallthrough. `TwinCATDataType.Structure` is a declared
@@ -230,7 +230,7 @@ a dedicated managed task before invoking `OnChange`/`OnDataChange`, exactly as t
 | Severity | Medium |
 | Category | Concurrency & thread safety |
 | Location | `TwinCATDriver.cs:80-99`, `41-72`, `366-388` |
-| Status | Open |
+| Status | Resolved |
 
 **Description:** `ShutdownAsync` mutates `_devices`, `_tagsByName`, and `_nativeSubs` with no
 synchronization while `ReadAsync`/`WriteAsync`/`SubscribeAsync` may be iterating or indexing
@@ -257,7 +257,7 @@ tasks before disposing `DeviceState`s.
 | Severity | Medium |
 | Category | Error handling & resilience |
 | Location | `AdsTwinCATClient.cs:178-195` |
-| Status | Open |
+| Status | Resolved |
 
 **Description:** `BrowseSymbolsAsync` checks `cancellationToken.IsCancellationRequested` and
 does `yield break` (a clean completion) rather than throwing `OperationCanceledException`.
@@ -281,7 +281,7 @@ discovery.
 | Severity | Medium |
 | Category | Error handling & resilience |
 | Location | `TwinCATStatusMapper.cs:29-42` |
-| Status | Open |
+| Status | Resolved |
 
 **Description:** ADS error-code mapping has gaps and an inconsistency versus
 `docs/v2/driver-specs.md` section 6. The spec documents symbol-not-found as 0x0701
@@ -307,7 +307,7 @@ to `BadOutOfService`/`BadInvalidState`.
 | Severity | Medium |
 | Category | Performance & resource management |
 | Location | `TwinCATDriver.cs:102`, `AdsTwinCATClient.cs:178-195` |
-| Status | Open |
+| Status | Resolved |
 
 **Description:** `GetMemoryFootprint()` returns a hard-coded 0. `docs/v2/driver-stability.md`
 section "In-process only (Tier A/B) — driver-instance allocation tracking" requires the