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feat(rag): overlapping chunker, retrieval knobs, sqlite-vec index

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- Chunker: char overlap across boundaries + hard-split of oversized paragraphs.
- Retrieval knobs: rag_top_k / rag_min_score in settings + Settings UI.
- Vector index: sqlite-vec ANN over document embeddings, dual-written and
  backfilled, with brute-force cosine as the guaranteed fallback.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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jon
2026-07-23 13:58:05 -05:00
co-authored by Claude Opus 4.8
parent ac0eb1e5f6
commit f4aea78b55
6 changed files with 216 additions and 11 deletions
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requirements-windows.txt
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@@ -12,6 +12,9 @@ psutil
# Document ingest (RAG): pure-Python text extraction, no native deps
pypdf
python-docx
# Vector search: loadable SQLite extension (prebuilt wheels). Brute-force cosine
# stays as the fallback when the host Python can't load extensions.
sqlite-vec
# Native desktop window for the UI (WebView2 on Windows; pulls pythonnet).
# Used by bin/nexus_window.py, launched from launch_nexus.ps1.