Add Qwen tail and chunk ablations

run_smoke_easycom_direct.sh

@@ -16,16 +16,20 @@ LOG_ROOT="${LOG_ROOT:-${PROJECT_ROOT}/logs/easycom_direct_smoke}"
 
 SESSION_ID="${SESSION_ID:-1}"
 GPU="${GPU:-0}"
+MODE="${MODE:-open-stream-replay}"
 # Short smoke: END=4. Full session smoke: END="" (empty).
 END="${END:-4}"
 MEMORY_SECONDS="${MEMORY_SECONDS:-20}"
+# The historical short smoke used persistent KV (0). Override this to 8 for
+# the matched bounded-memory chunk ablation.
+SHORT_MEMORY_SECONDS="${SHORT_MEMORY_SECONDS:-0}"
 VIDEO_FPS="${VIDEO_FPS:-2}"
 
 session="Session_${SESSION_ID}"
 session_dir="${VIDEO_ROOT}/${session}"
 target="${TARGET_ROOT}/${session}.npy"
-output="${FEATURE_ROOT}/${session}_gpu${GPU}.pt"
-log="${LOG_ROOT}/${session}_gpu${GPU}.log"
+output="${FEATURE_ROOT}/${session}_${MODE}_gpu${GPU}.pt"
+log="${LOG_ROOT}/${session}_${MODE}_gpu${GPU}.log"
 
 mkdir -p "${FEATURE_ROOT}" "${LOG_ROOT}"
 cd "${PROJECT_ROOT}"
@@ -36,13 +40,13 @@ extra_args=()
 if [[ -n "${END}" ]]; then
   # Bounded smoke: do not pass --target (length would conflict with --end).
   extra_args+=(--end "${END}")
-  MEMORY_SECONDS=0
+  MEMORY_SECONDS="${SHORT_MEMORY_SECONDS}"
 else
   [[ -s "${target}" ]] || { echo "Missing: ${target}" >&2; exit 1; }
   extra_args+=(--target "${target}")
 fi
 
-echo "GPU=${GPU} session=${session} end=${END:-full} memory=${MEMORY_SECONDS}"
+echo "GPU=${GPU} session=${session} mode=${MODE} end=${END:-full} memory=${MEMORY_SECONDS}"
 echo "log -> ${log}"
 
 {
@@ -52,7 +56,7 @@ echo "log -> ${log}"
       --model-id "${MODEL}" \
       --easycom-session-dir "${session_dir}" \
       --use-audio-in-video \
-      --mode open-stream-replay \
+      --mode "${MODE}" \
       --memory-seconds "${MEMORY_SECONDS}" \
       --video-fps "${VIDEO_FPS}" \
       --dtype bfloat16 \