Search has run on the graph store's native symbol FTS since the indexer
stopped building a parallel corpus, so the in-process BM25 index, its
bigram typo rescue and the sparse-ngram tokenizer had no caller left.
Delete them with the tests that only exercised them, move the hybrid
de-chunk fixtures onto a map-backed text double and the path-scoping
fixtures onto the ordered backend, and retarget the prose that still
described the retired stack at the FTS adapter.
Andrey Kumanyaev
5f2a6b9ebb