Improve MCC testing workflow resilience

.skills/mcc-integration-testing/scripts/common.sh

@@ -0,0 +1,110 @@
+#!/usr/bin/env bash
+
+sed_in_place() {
+    if [[ "$(uname)" == "Darwin" ]]; then
+        sed -i '' "$@"
+    else
+        sed -i "$@"
+    fi
+}
+
+ensure_java_in_path() {
+    if command -v java >/dev/null 2>&1 && java -version >/dev/null 2>&1; then
+        return 0
+    fi
+
+    local candidate
+    for candidate in \
+        "${JAVA_BIN:-}" \
+        "/opt/homebrew/opt/openjdk/bin/java" \
+        "/usr/local/opt/openjdk/bin/java" \
+        "/usr/lib/jvm/default-java/bin/java"
+    do
+        [[ -z "$candidate" ]] && continue
+        if [[ -x "$candidate" ]]; then
+            export PATH="$(dirname "$candidate"):$PATH"
+            export JAVA_BIN="$candidate"
+            if java -version >/dev/null 2>&1; then
+                return 0
+            fi
+        fi
+    done
+
+    echo "java was not found on PATH. Install Java or set JAVA_BIN." >&2
+    return 1
+}
+
+server_session_name() {
+    printf 'mc-%s\n' "${1//./_}"
+}
+
+server_running() {
+    local version="$1"
+    mc-list | grep -Fq "$(server_session_name "$version")"
+}
+
+wait_for_server_ready() {
+    local version="$1"
+    local timeout="${2:-60}"
+    local elapsed=0
+
+    while (( elapsed < timeout )); do
+        if mc-log "$version" 250 2>/dev/null | grep -Fq "Done ("; then
+            return 0
+        fi
+        sleep 1
+        ((elapsed += 1))
+    done
+
+    echo "Timed out waiting for $version to become ready" >&2
+    return 1
+}
+
+wait_for_server_stop() {
+    local version="$1"
+    local timeout="${2:-60}"
+    local elapsed=0
+
+    while (( elapsed < timeout )); do
+        if ! server_running "$version"; then
+            return 0
+        fi
+        sleep 1
+        ((elapsed += 1))
+    done
+
+    mc-kill "$version" >/dev/null 2>&1 || true
+
+    if ! server_running "$version"; then
+        return 0
+    fi
+
+    echo "Timed out waiting for $version to stop" >&2
+    return 1
+}
+
+disable_noisy_bots_in_ini() {
+    local ini_file="$1"
+    local section
+
+    for section in \
+        ScriptScheduler \
+        DiscordRpc \
+        AntiAFK \
+        AutoDig \
+        AutoAttack \
+        PlayerListLogger \
+        ReplayCapture
+    do
+        sed_in_place "/^\\[ChatBot\\.${section}\\]/,/^\\[/ { s/^Enabled = true/Enabled = false/; }" "$ini_file"
+    done
+}
+
+remove_stale_stdin_pipe() {
+    local version="$1"
+    local pipe_path="$MCC_SERVERS/$version/stdin.pipe"
+
+    if [[ -e "$pipe_path" && ! -p "$pipe_path" ]]; then
+        rm -f "$pipe_path"
+    fi
+}