feat(run): auto-focus TradeStation by window_title at startup

pygetwindow.activate() brings the calibrated window to the foreground so
the user doesn't need to alt-tab during the startup-delay. Largest window
matching cfg.window_title (case-insensitive substring) wins. If minimized,
restore first. Failures are warnings, not errors — user can still focus
it manually during the countdown.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/atm/main.py

@@ -177,9 +177,31 @@ def _cmd_run(args) -> None:
         duration_s = (stop - now).total_seconds()
         print(f"Will stop at {stop:%Y-%m-%d %H:%M} (duration {duration_s/3600:.2f}h)", flush=True)
 
+    # Auto-focus TradeStation by title substring so user doesn't need to alt-tab
+    if not capture_stub and cfg.window_title:
+        try:
+            import pygetwindow as gw  # type: ignore[import-untyped]
+            needle = cfg.window_title.lower()
+            matches = [w for w in gw.getAllWindows() if w.title and needle in w.title.lower()]
+            # Prefer largest window (the main chart, not a tooltip or child)
+            matches.sort(key=lambda w: (w.width or 0) * (w.height or 0), reverse=True)
+            if matches:
+                win = matches[0]
+                try:
+                    if win.isMinimized:
+                        win.restore()
+                    win.activate()
+                    print(f"Focused window: {win.title!r}", flush=True)
+                except Exception as exc:
+                    print(f"Could not focus {win.title!r}: {exc}", flush=True)
+            else:
+                print(f"WARN: no window contains {cfg.window_title!r} — bring TradeStation to front manually", flush=True)
+        except ImportError:
+            pass
+
     delay = getattr(args, "startup_delay", 0.0)
     if delay > 0 and not capture_stub:
-        print(f"Bring TradeStation to front, minimize PowerShell/VS Code. Starting in {delay:.0f}s...", flush=True)
+        print(f"Starting in {delay:.0f}s (TradeStation should be in front)...", flush=True)
         for i in range(int(delay), 0, -1):
             print(f"  {i}...", flush=True)
             time.sleep(1.0)