Replace the silent contextlib.suppress(Exception) block in the session
create command with a try/except that logs at WARNING level with exc_info.

Previously, any exception raised by _facade_dispatch() during session
creation was silently discarded with no logging, making it impossible to
diagnose failures in the facade layer (e.g. A2A bootstrap unavailable,
programming errors, infrastructure issues).

The fix keeps session creation non-fatal (the session is already persisted
before the facade call) while ensuring the exception is visible in logs:

    try:
        _facade_dispatch(session.create, {...})
    except Exception as _exc:
        _log.warning(
            session_create_facade_dispatch_failed,
            extra={"session_id": ..., "error": str(_exc)},
            exc_info=True,
        )

Also includes the TDD regression test from issue #10414 (PR #10749) with
@tdd_expected_fail removed, since the fix is now applied. The test verifies
that a WARNING log entry is emitted when _facade_dispatch() raises and that
session creation still exits 0.

ISSUES CLOSED: #10433

@@ -0,0 +31,4 @@
+
+def _make_mock_session() -> MagicMock:
+    """Build a minimal mock Session object sufficient for the create command."""
+    mock_session = MagicMock(spec=Session)

@@ -0,0 +32,4 @@
+def _make_mock_session() -> MagicMock:
+    """Build a minimal mock Session object sufficient for the create command."""
+    mock_session = MagicMock(spec=Session)
+    mock_session.session_id = "01JTEST000000000000000000000"

@@ -195,13 +195,17 @@ def create(
         # Notify the facade layer for A2A protocol bookkeeping.
         # Pass session_id so the facade handler acknowledges the already-