Add interactive WebKit memory watcher script

scripts/memory-test.sh records peak/min WebKit RSS per user-driven
phase (login, global scroll, following scroll, thread open, etc.)
and writes a TSV for side-by-side comparison between builds. Used
during the v0.12.8 OOM investigation and kept for future
regressions. Output files gitignored.

.gitignore

@@ -22,6 +22,9 @@ screenshots/
 *.png
 !src-tauri/icons/*.png
 
+# Memory test output (produced by scripts/memory-test.sh)
+memory-test-*.tsv
+
 # Private docs (drafts, specs, research, grant applications)
 private_docs/
 test/accounts.json

scripts/memory-test.sh

@@ -0,0 +1,79 @@
+#!/usr/bin/env bash
+# Vega memory test — records peak WebKit RSS per phase.
+# Start vega first, then run this script. Press Enter to advance phases.
+# Usage: ./scripts/memory-test.sh [label]
+
+LABEL="${1:-$(date +%Y%m%d-%H%M%S)}"
+OUTFILE="memory-test-${LABEL}.tsv"
+
+phases=(
+  "1:baseline_before_login"
+  "2:after_login_idle"
+  "3:global_scroll_full"
+  "4:following_tab_idle"
+  "5:following_scroll_full"
+  "6:trending_tab"
+  "7:thread_open"
+  "8:profile_view"
+  "9:back_to_global"
+)
+
+get_webkit_mb() {
+  ps aux --no-headers | awk '/webkit2gtk/ && !/awk/ {sum += $6} END {printf "%d", sum/1024}'
+}
+
+echo -e "phase\tpeak_mb\tmin_mb\tsamples" > "$OUTFILE"
+echo ""
+echo "=== Vega Memory Test: $LABEL ==="
+echo "Output → $OUTFILE"
+echo ""
+
+for entry in "${phases[@]}"; do
+  num="${entry%%:*}"
+  name="${entry#*:}"
+
+  echo "──────────────────────────────────────"
+  echo "Phase $num: $name"
+  read -r -p "  → Perform the action, then press Enter to START recording: "
+
+  peak=0; min=9999999; count=0
+  stop_file=$(mktemp)
+  rm "$stop_file"   # file absence = keep sampling
+
+  # Background sampler writes readings to a temp file
+  tmpdata=$(mktemp)
+  (
+    while [[ ! -f "$stop_file" ]]; do
+      mb=$(get_webkit_mb)
+      echo "$mb" >> "$tmpdata"
+      echo -n " ${mb}"
+      sleep 1
+    done
+  ) &
+  sampler_pid=$!
+
+  read -r -p "  → Press Enter to STOP recording: "
+  touch "$stop_file"
+  wait "$sampler_pid" 2>/dev/null
+  echo ""
+
+  while IFS= read -r mb; do
+    [[ -z "$mb" ]] && continue
+    (( mb > peak )) && peak=$mb
+    (( mb < min )) && min=$mb
+    (( count++ ))
+  done < "$tmpdata"
+  rm -f "$tmpdata" "$stop_file"
+
+  [[ $count -eq 0 ]] && peak=0 && min=0
+  echo "  ✓ Peak: ${peak}MB   Min: ${min}MB   Samples: ${count}"
+  echo -e "${name}\t${peak}\t${min}\t${count}" >> "$OUTFILE"
+  echo ""
+done
+
+echo "══════════════════════════════════════"
+echo "Results: $LABEL"
+echo ""
+column -t -s $'\t' "$OUTFILE"
+echo ""
+echo "Saved to: $OUTFILE"