fix(registry): a write repairs a YAML that a failed migration left in format 1 (Issue #71)

The writer commits the migrated DB before it replaces the YAML. If that
replacement failed, the DB said format 2 and the next run did nothing.
When the DB is current the writer now also reads the YAML's format and
rewrites a YAML that is older or missing.

Refs #71

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.agents/skills/lib_py/atomic_yaml.py

@@ -124,6 +124,17 @@ def atomic_dump_yaml_main():
         if from_version < registry_format.CURRENT:
             d, migrated_rows = registry_format.migrate(d)
             force_yaml = True
+        elif row:
+            # The DB is current; its YAML copy may not be (a migration whose
+            # YAML rewrite failed after the DB commit). Then rewrite it.
+            y = None
+            if os.path.exists(yaml_path):
+                try:
+                    with open(yaml_path) as f:
+                        y = yaml.safe_load(f)
+                except Exception:
+                    y = None
+            force_yaml = registry_format.stored_version(y) < registry_format.CURRENT
 
         old_sessions = get_all_sessions_status(d)
         # a mutation that replaces a row the monitor registered for a pane it