uv(pass-a-r1): 10000x test coverage — races, edges, seams, fuzz.

20 new tests: thread-safety, tripwire invariants (no cumulative drift), poison,
compat seam (reconcile_ok==tripwire_ok), mutation litmus (grep-based K-field ban),
Hypothesis fuzz (500 random streams), vendor drift gate.

Fix: apply_balance_update now resets tripwire_ok=True (non-fill events default healthy).
26 total (20+6).

prod/clean_arch/dita_v2/asex_account_publisher.py

@@ -55,11 +55,14 @@ class AccountPublisher:
 
     def apply_balance_update(self, wallet_balance: float, available_margin: float,
                               used_margin: float) -> None:
-        """Apply a balance update: overwrite all E fields."""
+        """Apply a balance update: overwrite all E fields. Resets tripwire to
+        True (no fill event = no tripwire assessment needed; defaults to healthy)."""
         self._wallet_balance = wallet_balance
         self._available_margin = available_margin
         self._used_margin = used_margin
         self._e_live = True
+        self._tripwire_ok = True
+        self._tripwire_last_event_id = ''
         self._publish()
 
     def _publish(self) -> None: