fix: log instead of silently passing on failed-dispatch cleanup

Addresses the code-quality lint on the best-effort hash delete in
dispatch_invocation's failure path: replace the bare `except: pass` with a
logger.debug carrying the invocation_id. No behavior change — cleanup stays
best-effort and still returns a failed Invocation.

Author: dartpain

application/devices/broker.py

@@ -297,7 +297,9 @@ def dispatch_invocation(
             try:
                 redis.delete(_inv_key(invocation_id))
             except Exception:
-                pass
+                logger.debug(
+                    "cleanup after failed dispatch failed for %s", invocation_id
+                )
             inv.error = "device broker dispatch failed"
             inv.completed = True
         return inv