Remove redundant debugLog util (#295)

utils/activity.ts

@@ -1,21 +1,9 @@
 import { performance } from "node:perf_hooks";
-import * as core from "@actions/core";
+import { log } from "./log.ts";
 
 export const DEFAULT_ACTIVITY_TIMEOUT_MS = 60_000;
 export const DEFAULT_ACTIVITY_CHECK_INTERVAL_MS = 5_000;
 
-// inline debug check — can't import log.ts since activity.ts is a dependency of it
-function debugLog(msg: string): void {
-  const isDebug =
-    process.env.LOG_LEVEL === "debug" ||
-    process.env.ACTIONS_STEP_DEBUG === "true" ||
-    process.env.RUNNER_DEBUG === "1" ||
-    core.isDebug();
-  if (isDebug) {
-    core.info(`[${new Date().toISOString()}] [DEBUG] ${msg}`);
-  }
-}
-
 type ActivityTimeoutContext = {
   timeoutMs: number;
   checkIntervalMs: number;
@@ -85,11 +73,11 @@ function startProcessOutputMonitor(ctx: OutputMonitorContext): OutputMonitor {
   process.stdout.write = wrapWrite(originalStdoutWrite, markActivity);
   process.stderr.write = wrapWrite(originalStderrWrite, markActivity);
 
-  debugLog(`process activity monitor started: timeout=${ctx.timeoutMs}ms`);
+  log.debug(`process activity monitor started: timeout=${ctx.timeoutMs}ms`);
 
   const intervalId = setInterval(() => {
     const idleMs = getIdleMs();
-    debugLog(`process activity check: idle=${idleMs}ms / ${ctx.timeoutMs}ms`);
+    log.debug(`process activity check: idle=${idleMs}ms / ${ctx.timeoutMs}ms`);
     if (timedOut || idleMs <= ctx.timeoutMs) return;
     timedOut = true;
     ctx.onTimeout(idleMs);