fix: harden search reliability and indexing hygiene

[PatrickSys]

Summary

• Tighten retrieval quality with bounded query expansion, candidate floor, low-confidence rescue, and stronger non-test noise controls.
• Improve runtime reliability: preserve incremental short-circuit stats, dedupe overlapping file scans, normalize resource URIs, and quote LanceDB schema fields correctly.
• Reduce noisy guidance by filtering complementary/testing conflict false positives and add search-quality diagnostics in search_codebase responses.

Why

• This keeps v1.5.0 grounded and usable under real agent prompts: fewer misleading hits, cleaner safety signals, and more stable indexing/status behavior.

[greptile-apps]

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[chatgpt-codex-connector]

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