Command line interface for accessing the Open Web Index shards and slices.

docs: update cmd/ → compat/ references and refresh testing guide master

- dev.md: update architecture tree to show compat/ shim and note that new code should not import from it - testing.md: refresh test organization to include new test files (test_search, test_aggregate, test_query_unit, test_executors pool/retry) and document default integration skip via addopts - hardening.md: mark SEC-C3 resolved (cmd/ removed), update SEC-M5 and Appendix B file paths to compat/batch.py Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>


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