Add causal MiniCPM-o streaming feature extraction

PROJECT_CONTEXT.md

@@ -60,6 +60,15 @@ result.
   the original wearer probabilities, excludes wearer backchannels from
   headline ENTRY FPR, and records unanchored/ambiguous cases.
 
+### Implemented but not GPU-verified
+
+- MiniCPM-o 4.5 input-only feature extraction has two unmeasured modes: a
+  native 1 Hz state causally held on the 5 Hz grid, and a 5 Hz completed-cache
+  plus temporary-partial-tail branch. The latter refuses the normal
+  head-loading contract unless boundary, replay, snapshot-restoration, and
+  future-audio checks pass. A real-GPU smoke run is still required; see
+  [`docs/minicpmo_streaming_features.md`](docs/minicpmo_streaming_features.md).
+
 ### Measured screening result
 
 - The released EgoSpeak MiniROADA A+V checkpoint on Sessions 1--3 obtains