…d/invalid item context

we also explicitly hangup if the store says something is invalid

this probalby doesn't hurt to include, but we're particular about using our AHash so we'll leave it explicit for now

- rename InsertBatch -> InsertResult
- use for loop in pending_cache instead of while loop
- consistent Self::Key usage in trait

- recon pending tracking simplified to just retry every batch since we should get items close together
- fixes a bug where any event in an api batch that was invalid could have crashed the entire batch (now only that one gets an error)
- TODO: still need to modify the service to have a better validation hook that keeps track of the data we need to return so we don't have to iterate back through or lose info along the way

…n phases