build: update Pro pin for CI test fixes

Pin Phoenix Pro to cb3f10626fcdf7a734aecccac519a79c4b42194f, including
the visible unsupported-environment marker for CLI Sessions, awaited PTY
fixture cleanup, and the recorded inbox-monitor verification.

The marker prevents empty-suite registration from aborting desktop Linux
and browser test startup. Waiting for terminal kills avoids handing the
next suite a fixture directory still held open by a Windows shell.

Validation: CLI suites 52/52 on Windows, macOS and Linux; rebuilt Linux CI
unit suite 3045/3045 on rerun; Chromium unit suite 2859/2859. Browser
integration had one timeout, cleared by its complete 7/7 suite rerun.
The Pro handoff records broader-run limitations and the hosted Actions
follow-up after the user's push.

Author: abose

tracking-repos.json

@@ -1,5 +1,5 @@
 {
   "phoenixPro": {
-    "commitID": "b4bf851d1f6bf83adce8581a974a7005f3b1ee58"
+    "commitID": "cb3f10626fcdf7a734aecccac519a79c4b42194f"
   }
 }