style: normalize indentation in Orchestrator.mqh via clang-format

Whitespace-only: consistent 3-space indentation throughout (was a mix of
3/4/5/6.. spaces). Repo conventions preserved: for(/if( spacing, access
labels, attached braces. Adds .clang-format so the style is reproducible
(run: clang-format -i --style=file <file>).

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

MQL5/Experts/MultiAgentTest/.clang-format

@@ -0,0 +1,15 @@
+BasedOnStyle: LLVM
+IndentWidth: 3
+TabWidth: 3
+UseTab: Never
+ColumnLimit: 0
+BreakBeforeBraces: Attach
+AllowShortFunctionsOnASingleLine: All
+AllowShortBlocksOnASingleLine: Always
+AllowShortIfStatementsOnASingleLine: true
+AllowShortLoopsOnASingleLine: true
+SortIncludes: false
+SpaceBeforeParens: Never
+IndentCaseLabels: true
+AccessModifierOffset: -3
+PointerAlignment: Right