[tooling] anvil_fork.sh has no SIGINT/SIGTERM/EXIT trap — Ctrl-C leaves orphan anvil on 8545

[obchain]

Refs #52

File: scripts/anvil_fork.sh

Problem

Script spawns anvil but does not trap signals. On Ctrl-C or terminal close, parent bash dies; anvil keeps running holding port 8545. Next invocation fails with 'address already in use'. Operator must pkill anvil manually.

Fix

ANVIL_PID=""
cleanup() {
  if [[ -n "$ANVIL_PID" ]]; then
    kill -TERM "$ANVIL_PID" 2>/dev/null || true
    wait "$ANVIL_PID" 2>/dev/null || true
  fi
}
trap cleanup EXIT INT TERM

anvil ... &
ANVIL_PID=$!
wait "$ANVIL_PID"

[obchain]

Already fixed at HEAD of feat/24-anvil-fork: script ends with exec anvil, replacing the bash process — SIGINT/SIGTERM reach anvil directly, no orphan possible, no trap needed.