review: trim verbose comments, cover Reconcile, table-driven Classify tests

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- shorten the multi-line doc comments flagged as too verbose
- add reconcile_test.go: direct unit tests for Reconcile incl. the
  persisted-but-errored and classify-error branches (previously only
  reached indirectly through the engine integration tests)
- convert the 11 near-identical Classify It blocks to a DescribeTable

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