fix: address code review findings — batch args, venv path, serve flags

- Fix missing BATCH_ARGS in long-context commands (both benchmark scripts)
- Fix CLAUDE.md stale venv path (data/venv → .venv) and add serve/power docs
- Add -b/--batch to bin/benchmark help text
- Add --no-think flag to serve script (--reasoning-budget 0)
- Sanitize model names in eval run directories
- Simplify agentic setup to use requirements.txt
- Add serve --help test, batch flag assertions to existing tests
- Add requirements.txt for reproducible venv setup (Python 3.13)

scripts/benchmark/run-suite.sh

@@ -252,7 +252,7 @@ for MODEL_PATH in "${MODEL_PATHS[@]}"; do
                 UB_SIZE=2048; [[ "$BACKEND" == *vulkan* ]] && UB_SIZE=512
                 CMD_LC=(toolbox run -c "$BACKEND" -- "${ENV_ARGS[@]}" "$BENCH_BIN"
                     -ngl 99 -mmp 0 -m "$TOOLBOX_MODEL_PATH" -fa 1
-                    -p "$CTX_PROMPT" -n 32 -d "$CTX_DEPTH" -ub "$UB_SIZE" -r "$REPS_LONGCTX" "${KV_ARGS[@]}")
+                    -p "$CTX_PROMPT" -n 32 -d "$CTX_DEPTH" -ub "$UB_SIZE" -r "$REPS_LONGCTX" "${BATCH_ARGS[@]}" "${KV_ARGS[@]}")
                 if "${CMD_LC[@]}" > "$OUT_LC" 2>&1; then
                     log_success "Done"; tail -3 "$OUT_LC"
                 else