fix(lease-broker): no lease held is a no-op success, not a denied transition (#1339)

packages/mosaic/framework/tools/lease-broker/revoke-lease.py

@@ -54,6 +54,22 @@ def main(
     arguments = parser.parse_args(argv)
     source_environment = os.environ if environ is None else environ
 
+    # D29: a session that never held a lease has nothing to revoke, and that is a
+    # SUCCESS, not a failed revocation. The block below is deliberately fail-closed
+    # for a broker that is unreachable, which is right — but it cannot distinguish
+    # "the broker is down" from "there was never a lease", so a bare-launched
+    # session was denied every lifecycle transition, including compaction. Denying
+    # compaction protects nothing there; it converts a recoverable context limit
+    # into a lost session.
+    #
+    # Absence must be TOTAL to qualify. If exactly one variable is present the
+    # session is half-provisioned, which is real misconfiguration, and it still
+    # takes the fail-closed path below.
+    lease_variables = ("MOSAIC_LEASE_BROKER_SOCKET", "MOSAIC_LEASE_SESSION_ID")
+    present = [name for name in lease_variables if source_environment.get(name)]
+    if not present:
+        return 0
+
     try:
         if not arguments.reason or len(arguments.reason) > 128:
             raise ValueError("invalid revoke reason")