component assesment and fixes done

docs/02_components/helpers/h04_faiss_index_manager_spec.md

@@ -107,6 +107,20 @@ H04 supports automatic fallback from GPU to CPU:
 - `set_device("gpu")`: Use GPU acceleration (faster for large indexes)
 - `set_device("cpu")`: Use CPU (fallback when GPU unavailable)
 
+## Current vs Future Use Cases
+
+### Current Use (MVP)
+- **Satellite Index Loading**: F08 uses `load_index()` to load pre-built satellite descriptor index from provider.
+- **Similarity Search**: F08 uses `search()` to find candidate satellite tiles.
+
+### Future Use Cases (build_index, add_descriptors)
+The `build_index()` and `add_descriptors()` methods are reserved for future features:
+1. **UAV Loop Closure Detection**: Build index of UAV frame descriptors to detect when UAV revisits previously seen areas.
+2. **Chunk-to-Chunk Matching**: Build index of chunk descriptors for matching disconnected trajectory segments.
+3. **Flight-to-Flight Matching**: Match current flight to previous flights for multi-flight consistency.
+
+**Note**: For MVP, F08 does NOT build satellite indexes - they are provided pre-built by the satellite data provider.
+
 ## Test Cases
 
 1. Build index with 10,000 UAV image descriptors → succeeds