fix(tests): set _ever_connected in reconnect-scenario test mocks

These pre-existing tests fake a successful first connect by calling
only _ready.set(), which is what the real code did before this PR.
Now that run() gates the initial-vs-reconnect branch on the new sticky
_ever_connected flag instead, their later simulated reconnect failures
were misclassified as never-connected and hit the 3-attempt ladder,
failing test_reconnect_counter_resets_after_successful_session,
test_parked_server_self_probes_and_revives, and
test_retry_attempts_log_debug_transitions_warn in CI. Set the flag
alongside _ready.set() to mirror the real success sites, same as the
new test added in tools/mcp_tool.py's own PR.

tests/tools/test_mcp_parked_self_probe.py

@@ -88,6 +88,7 @@ def test_parked_server_self_probes_and_revives(monkeypatch, tmp_path):
                     # First connect succeeds (sets _ready), then dies.
                     self.session = object()
                     self._ready.set()
+                    self._ever_connected = True
                     self.session = None
                     raise RuntimeError("backend outage begins")
                 if not state["backend_up"]:

tests/tools/test_mcp_reconnect_log_hygiene.py

@@ -68,6 +68,7 @@ def test_retry_attempts_log_debug_transitions_warn(monkeypatch, tmp_path, caplog
                 if state["transport_calls"] == 1:
                     self.session = object()
                     self._ready.set()
+                    self._ever_connected = True
                     self.session = None
                 raise ConnectionError("backend down")
 

tests/tools/test_mcp_reconnect_retry_reset.py

@@ -62,6 +62,7 @@ def test_reconnect_counter_resets_after_successful_session(monkeypatch, tmp_path
                     # First connect: succeed (sets _ready), then fail.
                     self.session = object()
                     self._ready.set()
+                    self._ever_connected = True
                     self.session = None
                     raise RuntimeError("blip 1")