docs: memory plan (sqlite+faiss)

2025-10-13 00:07:53 +13:00 · 2025-10-13 00:07:53 +13:00 · 45a6540cc4
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+# Memory Plan (sqlite + FAISS)
+- sqlite: embeddings.db with tables: chunks(id, file, sha, lineno, text, ts), vectors(id, dim, data BLOB)
+- faiss: faiss.index for fast ANN; sqlite is source of truth
+- provenance mandatory; ripgrep is canonical text source
+- journal is never overwritten; only append