feat(gateway): surface natural mid-turn assistant messages in chat platforms

Add display.interim_assistant_messages config (enabled by default) that
forwards completed assistant commentary between tool calls to the user
as separate chat messages. Models already emit useful status text like
'I'll inspect the repo first.' — this surfaces it on Telegram, Discord,
and other messaging platforms instead of swallowing it.

Independent from tool_progress and gateway streaming. Disabled for
webhooks. Uses GatewayStreamConsumer when available, falls back to
direct adapter send. Tracks response_previewed to prevent double-delivery
when interim message matches the final response.

Also fixes: cursor not stripped from fallback prefix in stream consumer
(affected continuation calculation on no-edit platforms like Signal).

Cherry-picked from PR #7885 by asheriif, default changed to enabled.
Fixes #5016

tests/tools/test_browser_camofox_state.py

@@ -59,8 +59,9 @@ class TestCamofoxConfigDefaults:
         browser_cfg = DEFAULT_CONFIG["browser"]
         assert browser_cfg["camofox"]["managed_persistence"] is False
 
-    def test_config_version_unchanged(self):
+    def test_config_version_matches_current_schema(self):
         from hermes_cli.config import DEFAULT_CONFIG
 
-        # managed_persistence is auto-merged by _deep_merge, no version bump needed
-        assert DEFAULT_CONFIG["_config_version"] == 13
+        # The current schema version is tracked globally; unrelated default
+        # options may bump it after browser defaults are added.
+        assert DEFAULT_CONFIG["_config_version"] == 15