fix: route component log files added after profile routing is already on

Adoption of a second home only wrapped the file handlers that existed at
adoption time. A later setup_logging(hermes_home=<known>, mode="gateway")
skipped _adopt_secondary_home (the home is already served) and appended a
bare _ManagedRotatingFileHandler for gateway.log, which carries no home
filter and so took every profile's gateway records. When a router is
already queued, the new handler is now wrapped in a _ProfileRoutingFileHandler
over the union of the live routers' homes.

Review finding: setup_logging(A); setup_logging(B); setup_logging(A, mode="gateway") wrote gw-b into A's gateway.log.

hermes_logging.py

@@ -669,6 +669,17 @@ def _add_rotating_handler(
     )
     if log_filter is not None:
         handler.addFilter(log_filter)
+    # Routing already on (a second home adopted earlier): a component log added now —
+    # ``mode="gateway"`` after the fact — must route too, or it takes every home's records.
+    routers = [h for h in _queued_file_handlers if isinstance(h, _ProfileRoutingFileHandler)]
+    if routers:
+        homes: set[Path] = set()
+        for router in routers:
+            homes.add(router._default_home)
+            homes.update(router._profile_homes)
+        routed = _ProfileRoutingFileHandler(handler, sorted(homes))
+        _quietly(handler.close)
+        handler = routed
     # Queue, not ``addHandler``: the rotation-lock wait never runs on the caller's thread.
     _register_queued_handler(handler)