fix(j1939): back off before Cannot Claim and a re-claim, fault a second claim in arbitration, and send without a pool hop

src/CanKit.Pro.J1939/IJ1939Node.cs

@@ -79,9 +79,17 @@ public interface IJ1939Node : IDisposable, IAsyncDisposable
     ///     per SAE J1939-81 §4.4.3.4 and throw
     ///     <see cref="J1939CannotClaimException"/> (SRS FR-J1939-004).</description></item>
     /// </list>
+    /// The Cannot Claim, and an arbitrary-address node's next claim after losing, go out after
+    /// the pseudo-random 0..153 ms backoff of SAE J1939-81 §4.4.4.3 -- the low byte of the
+    /// NAME's bytes summed, times 0.6 ms -- so two nodes colliding on an address do not answer in
+    /// lockstep (#58). The task faults after that Cannot Claim has gone out, in the order step
+    /// 3 gives, so disposing the node on the exception cannot suppress the frame; a further
+    /// claim started before it drops the Cannot Claim and faults this one at once.
     /// </summary>
     /// <exception cref="J1939CannotClaimException">The preferred address was lost to a
     /// higher-priority NAME and no fallback was available.</exception>
+    /// <exception cref="InvalidOperationException">A claim is still in arbitration: it is
+    /// not silently replaced -- await it, or cancel it, before claiming again (#58).</exception>
     Task ClaimAddressAsync(byte preferredAddress, CancellationToken cancellationToken = default);
 
     /// <summary>