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.Transport/Import/BundleSessionStore.cs

@@ -41,6 +41,11 @@ public sealed class BundleSessionStore : IBundleSessionStore
     // Options are accepted to honor the documented constructor contract and to
     // be ready for future per-store knobs (e.g. max in-flight sessions). The
     // current store does not read any field — TTL is on the session itself.
+    /// <summary>
+    /// Initializes a new <see cref="BundleSessionStore"/>.
+    /// </summary>
+    /// <param name="options">Transport options (reserved for future per-store configuration).</param>
+    /// <param name="timeProvider">Time provider used to evaluate session expiry.</param>
     public BundleSessionStore(IOptions<TransportOptions> options, TimeProvider timeProvider)
     {
         ArgumentNullException.ThrowIfNull(options);
@@ -48,6 +53,7 @@ public sealed class BundleSessionStore : IBundleSessionStore
         _timeProvider = timeProvider ?? throw new ArgumentNullException(nameof(timeProvider));
     }
 
+    /// <inheritdoc />
     public BundleSession Open(BundleSession session)
     {
         ArgumentNullException.ThrowIfNull(session);
@@ -58,6 +64,7 @@ public sealed class BundleSessionStore : IBundleSessionStore
         return session;
     }
 
+    /// <inheritdoc />
     public BundleSession? Get(Guid sessionId)
     {
         if (!_sessions.TryGetValue(sessionId, out var session)) return null;
@@ -66,11 +73,13 @@ public sealed class BundleSessionStore : IBundleSessionStore
         return null;
     }
 
+    /// <inheritdoc />
     public void Remove(Guid sessionId)
     {
         _sessions.TryRemove(sessionId, out _);
     }
 
+    /// <inheritdoc />
     public void EvictExpired()
     {
         var now = _timeProvider.GetUtcNow();