docs: add XML doc comments across src + Sister Projects section in CLAUDE.md

Bulk CommentChecker pass: fills in <param>/<inheritdoc> tags on public
APIs across all 23 src/ projects so the doc-coverage gate is green. Also
adds a Sister Projects section to CLAUDE.md pointing at the MxAccess
Gateway and OtOpcUa sibling repos, and gitignores local credential
captures (*login*.txt) and the wonder-app-vd03 deploy/ artifacts.

src/ScadaLink.TemplateEngine/LockEnforcer.cs

@@ -21,6 +21,8 @@ public static class LockEnforcer
     /// <summary>
     /// Validates that an attribute override does not violate lock or granularity rules.
     /// </summary>
+    /// <param name="original">The parent template's attribute definition.</param>
+    /// <param name="proposed">The child template's proposed override.</param>
     public static string? ValidateAttributeOverride(
         TemplateAttribute original,
         TemplateAttribute proposed)
@@ -48,6 +50,8 @@ public static class LockEnforcer
     /// <summary>
     /// Validates that an alarm override does not violate lock or granularity rules.
     /// </summary>
+    /// <param name="original">The parent template's alarm definition.</param>
+    /// <param name="proposed">The child template's proposed override.</param>
     public static string? ValidateAlarmOverride(
         TemplateAlarm original,
         TemplateAlarm proposed)
@@ -75,6 +79,8 @@ public static class LockEnforcer
     /// <summary>
     /// Validates that a script override does not violate lock or granularity rules.
     /// </summary>
+    /// <param name="original">The parent template's script definition.</param>
+    /// <param name="proposed">The child template's proposed override.</param>
     public static string? ValidateScriptOverride(
         TemplateScript original,
         TemplateScript proposed)
@@ -97,6 +103,9 @@ public static class LockEnforcer
     /// Validates that a lock flag change is legal.
     /// Locking is allowed on unlocked members. Unlocking is never allowed.
     /// </summary>
+    /// <param name="originalIsLocked">The current lock state of the member.</param>
+    /// <param name="proposedIsLocked">The proposed lock state.</param>
+    /// <param name="memberName">Name of the member being changed, for error messages.</param>
     public static string? ValidateLockChange(bool originalIsLocked, bool proposedIsLocked, string memberName)
     {
         if (originalIsLocked && !proposedIsLocked)