fix(test_framework): pass --max-speed to Java runner and drain stdout to prevent pipe stall

- Add maxSpeed param (default true) to runBattleRunner/runBattle
- Drain stdout in poll loop — Java blocked on full pipe buffer causing timeout
- TestBattleRunner.java already had --max-speed; .class was stale and needed recompile

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

common_libs/test_framework/runner_process.nim

@@ -7,19 +7,20 @@ const
   ScriptDir = currentSourcePath().parentDir() / ".." / ".." / "tools" / "battle_runner"
 
 proc runBattleRunner*(serverUrl: string, botDirs: seq[string], rounds: int,
-                      timeout: int = 30000): string =
+                      timeout: int = 30000, maxSpeed: bool = true): string =
   ## Starts TestBattleRunner as a subprocess. Returns captured stdout on success.
   ## Raises IOError on non-zero exit or TimeoutError on timeout.
   let jar = getEnv("TR_BATTLE_RUNNER", DefaultRunnerJar)
   let classDir = getEnv("TR_BATTLE_RUNNER_DIR", ScriptDir)
 
-  let args = @[
+  var args = @[
     "-cp", classDir & ":" & jar,
     "TestBattleRunner",
     "--server-url", serverUrl,
     "--rounds", $rounds,
     "--bot-dirs", botDirs.join(",")
   ]
+  if maxSpeed: args.add("--max-speed")
 
   let p = startProcess("java", args = args,
     options = {poUsePath, poStdErrToStdOut})
@@ -29,13 +30,12 @@ proc runBattleRunner*(serverUrl: string, botDirs: seq[string], rounds: int,
   let deadline = epochTime() + timeout.float / 1000.0
   var stdout = ""
   var line: string
-  # ponytail: poll instead of blocking readLine; 50ms sleep is fine for battle timescales
   while epochTime() < deadline:
+    # Drain stdout every iteration to prevent pipe-buffer stall
+    while p.outputStream.atEnd == false:
+      discard p.outputStream.readLine(line)
+      stdout.add(line & "\n")
     if p.peekExitCode() != -1:
-      # Process finished; drain remaining output without blocking
-      while p.outputStream.atEnd == false:
-        discard p.outputStream.readLine(line)
-        stdout.add(line & "\n")
       break
     sleep(50)