🧪 test: add edge case tests for lexical_queries

[undivisible]

🎯 What: The testing gap for lexical_queries edge cases is addressed.
📊 Coverage: Scenarios covered include: empty queries, single/multiple words, deduplication/case-insensitivity, FTS escaping of quotes, punctuation splitting, and query term bounds (32 limits).
✨ Result: The test coverage for the core lexical query logic is greatly improved.

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PR created automatically by Jules for task 17880421504660828994 started by @undivisible

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Note

Low Risk
Test-only change plus a visibility tweak for test access; no production behavior changes.

Overview
Adds direct unit coverage for lexical_queries, covering empty/single-term queries, case-insensitive dedup, quote escaping, punctuation splitting, and the 32-term cap.

Makes lexical_queries pub(super) so the new test can call it.

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[google-labs-jules]

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[undivisible]

Superseded by the reviewed and merged integration in #22.

[google-labs-jules]

Superseded by the reviewed and merged integration in #22.

Understood. Acknowledging that this work is now obsolete and stopping work on this task.