docs: add coverage reference files and flag architectural drift

These files catalog test coverage for Rust modules across architecture, implementation, and theory sections. They track recent structural changes, flag areas prone to documentation drift, and mandate verification of key parameters and routing logic to maintain alignment with the active codebase.
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+<!-- coverage sidecar — ne pas ajouter au nav mkdocs -->
+# Coverage: implementation/persistent_compact_int_vec.md
+
+## Code couvert
+
+- `obicompactvec/src/builder.rs` — PersistentCompactIntVecBuilder, cycle de vie
+- `obicompactvec/src/reader.rs` — PersistentCompactIntVec, accès aléatoire et séquentiel
+- `obicompactvec/src/intmatrix.rs` — PersistentCompactIntMatrix, wrapper colonne-major, append_column
+- `obicompactvec/src/format.rs` — format de fichier (magic PCIV, header, primary u8, overflow, index)
+
+## Notes
+
+Document d'implémentation stable. Vérifier que `append_column` (utilisé dans merge et reindex)
+est décrit. Vérifier que `PersistentCompactIntMatrixBuilder` est couvert (utilisé dans `layer.rs`).