fix(edge): daemon periodic ops (sync/heartbeat/flush) can't crash the loop

Wrap sync_config, send_heartbeat, and queue.flush operations in separate
try/except to ensure daemon survives periodic operation exceptions. Critical
for unattended 24/7 pilot devices where a locked database or disk error would
otherwise kill the entire loop. Per-frame step() handling unchanged.

edge/daemon.py

@@ -13,6 +13,7 @@ def run_loop(runtime, client, queue, *, clock, sleep, iterations=None,
             counters["frames"] += 1
         except Exception:
             counters["errors"] += 1
+        try:
             if sync_every and i % sync_every == 0:
                 cfg = client.fetch_config()
                 if cfg is not None:
@@ -25,6 +26,8 @@ def run_loop(runtime, client, queue, *, clock, sleep, iterations=None,
             if flush_every and i % flush_every == 0:
                 queue.flush()
                 counters["flushes"] += 1
+        except Exception:
+            counters["errors"] += 1
         if frame_interval:
             sleep(frame_interval)
     return counters

tests/test_daemon.py

@@ -41,3 +41,16 @@ def test_loop_survives_step_exception():
                         sync_every=99, heartbeat_every=99, flush_every=99)
     assert rt.steps == 3  # kept going past the exception
     assert counters["errors"] == 1
+
+
+def test_loop_survives_flush_exception():
+    class BoomQueue(_Queue):
+        def flush(self):
+            self.flushes += 1
+            raise RuntimeError("db locked")
+    rt = _Runtime()
+    counters = run_loop(rt, _Client(), BoomQueue(), clock=lambda: 0.0,
+                        sleep=lambda s: None, iterations=5,
+                        sync_every=99, heartbeat_every=99, flush_every=2)
+    assert rt.steps == 5          # loop kept running past the flush exceptions
+    assert counters["errors"] >= 1