feate: add stream processing modules and utility scripts

- Introduced , , , , , , , and  for advanced stream processing capabilities.
- Implemented  to manage memory response channels with a response queue.
- Added  module for delaying valid-tagged data without a ready path.
- Created  script to validate PULP coverage manifest entries and ensure compliance with licensing requirements.

scripts/check_pulp_manifest.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+manifest_file="licenses/pulp_common_cells_manifest.tsv"
+notice_file="NOTICE"
+
+if [[ ! -f "$manifest_file" ]]; then
+  printf 'missing PULP coverage manifest: %s\n' "$manifest_file" >&2
+  exit 1
+fi
+
+failed=0
+declare -A seen_sources
+declare -A seen_files
+while IFS=$'\t' read -r upstream_commit upstream_source status common_file common_component; do
+  [[ -z "$upstream_commit" || "$upstream_commit" == \#* ]] && continue
+  if [[ -z "$upstream_source" || -z "$status" || -z "$common_file" || -z "$common_component" ]]; then
+    printf 'malformed PULP manifest entry: %s\n' "$upstream_source" >&2
+    failed=1
+    continue
+  fi
+  if [[ -n "${seen_sources[$upstream_source]:-}" ]]; then
+    printf 'duplicate upstream source in PULP manifest: %s\n' "$upstream_source" >&2
+    failed=1
+  fi
+  seen_sources[$upstream_source]=1
+  if [[ ! -f "$common_file" ]]; then
+    printf 'mapped common file does not exist: %s\n' "$common_file" >&2
+    failed=1
+    continue
+  fi
+  if [[ "$status" != "covered" && "$status" != "extended" && "$status" != "new" ]]; then
+    printf 'invalid PULP manifest status for %s: %s\n' "$upstream_source" "$status" >&2
+    failed=1
+  fi
+  if [[ "$status" != "covered" ]]; then
+    seen_files[$common_file]=1
+  fi
+done < "$manifest_file"
+
+for common_file in "${!seen_files[@]}"; do
+  if ! head -n 40 "$common_file" | rg -q 'SPDX-License-Identifier: SHL-0.51|SPDX-License-Identifier: Apache-2.0 WITH SHL-2.1'; then
+    printf 'derived file lacks compatible upstream SPDX notice: %s\n' "$common_file" >&2
+    failed=1
+  fi
+  if ! rg -F -q "$common_file" "$notice_file"; then
+    printf 'derived file missing from NOTICE: %s\n' "$common_file" >&2
+    failed=1
+  fi
+done
+
+exit "$failed"