Adds <summary>/<param>/<returns>/<inheritdoc> where missing and removes
project bookkeeping IDs (task/tracking refs) from shipped code comments,
so the docs read cleanly and CommentChecker is quiet except for known
false positives (PLC/protocol terms, event/IEqualityComparer inheritdoc).
Doc/comment-only; no logic changed; solution builds clean.
First review at 7286d320. -001 (Low): ReadArrayLength doc corrected (positive int32 via
TryGetInt32, not uint). -002 (Structure datatype doc) Open. Consistent with the sibling
Driver.TwinCAT-017 ArrayLength flow.
Move TwinCATDriverOptions and TwinCATDataType enum to a new
Driver.TwinCAT.Contracts sibling project. TwinCATDataTypeExtensions
(which uses DriverDataType from Core.Abstractions) stays in the
runtime driver as TwinCATDataTypeExtensions.cs.
Replace two doc-comment references:
<see cref="Core.Abstractions.PollGroupEngine"/> → <c>PollGroupEngine</c>
<see cref="TwinCATAmsAddress.TryParse"/> → <c>TwinCATAmsAddress.TryParse</c>
per the approved decision — no compilable usings were present.
The runtime Driver.TwinCAT project gains a ProjectReference to .Contracts;
the .slnx is updated accordingly.
Joseph Doherty