release api/v1.2.0

Webber through the boilerroom wrapper: flavor-adaptive tool_choice,
session identity at rank 20, and the sanitized-client wiring fix
that makes the choke point real.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

webber-api/tests/test_provider_backend.py

@@ -82,7 +82,11 @@ def test_body_signals_are_logged(monkeypatch):
     monkeypatch.setattr(provider, "logger", StubLogger())
 
     class Busy:
-        model_extra = {"balancing": [{"parked": "librarian"}], "compaction_due": True}
+        def __init__(self):
+            self.model_extra = {
+                "balancing": [{"parked": "librarian"}],
+                "compaction_due": True,
+            }
 
     provider._log_wrapper_signals(Busy())
     assert any(kind == "info" and "parked" in msg for kind, msg in calls)
@@ -91,7 +95,8 @@ def test_body_signals_are_logged(monkeypatch):
     calls.clear()
 
     class Quiet:
-        model_extra = {"balancing": [], "compaction_due": False}
+        def __init__(self):
+            self.model_extra = {"balancing": [], "compaction_due": False}
 
     provider._log_wrapper_signals(Quiet())
     assert calls == []